Knowledge (XXG)

Agate

Source 📝

764: 783: 872: 654: 358: 596: 620: 36: 803: 749: 638: 763: 815: 2705: 2134: 886: 382:. Cavities are then filled in with silica-rich fluids from the volcanic material, layers are deposited on the walls of the cavity slowly working their way inwards. The first layer deposited on the cavity walls is commonly known as the priming layer. Variations in the character of the solution or in the conditions of deposition may cause a corresponding variation in the successive layers. These variations in layers result in bands of 858: 608: 2693: 350: 782: 726:
was one of the centers which made use of agate on an industrial scale. Where in the beginning locally found agates were used to make all types of objects for the European market, this became a globalized business around the turn of the 20th century: Idar-Oberstein imported large quantities of agate
434:
typically found in Mexico, is often brightly colored with a complex pattern, demonstrating randomized distribution of contour lines and circular droplets, scattered throughout the rock. The stone is typically coloured red and white but is also seen to exhibit yellow and grey combinations as well.
390:
forming banded agate. Hollow agates can also form due to the deposition of liquid-rich silica not penetrating deep enough to fill the cavity completely. Agate will form crystals within the reduced cavity, and the apex of each crystal may point towards the center of the cavity.
398:
resulting in a rust like appearance. Agate is very durable, and is often found detached from its host matrix, which has eroded. Once removed, the outer surface is usually pitted and rough from filling the cavity of its former matrix. Agates have also been found in
483:
and dolomite strata of marine origin. Like volcanic-origin agates, Coldwater agates formed from silica gels that lined pockets and seams within the bedrock. These agates are typically less colorful, with banded lines of grey and white chalcedony.
727:
from Brazil, as ship's ballast. Making use of a variety of proprietary chemical processes, they produced colored beads that were sold around the globe. Agates have long been used in arts and crafts. The sanctuary of a Presbyterian church in
441:, as the name suggests, exhibits a moss-like pattern and is of a greenish colour. The coloration is not created by any vegetative growth, but rather through the mixture of chalcedony and oxidized iron hornblende. 365:
Agate minerals have the tendency to form on or within existing rocks, creating difficulties in accurately determining their time of formation. Their host rocks have been dated to have formed as early as the
734:
Industrial uses of agate exploit its hardness, ability to retain a highly polished surface finish and resistance to chemical attack. It has traditionally been used to make knife-edge bearings for
520:
is a finely-banded and usually colorless agate, that when thinly sliced, exhibits spectral decomposition of white light into its constituent colors, requiring 400 to up to 30,000 bands per inch.
411:; these sedimentary rocks acquire cavities often from decomposed branches or other buried organic material. If silica-rich fluids are able to penetrate into these cavities agates can be formed. 1130: 748: 514:. It has been suggested that growth is not crystallographically controlled but is due to the filling-in of spaces between pre-existing crystals which have since dissolved. 500:
is found as sizable geodes of layered nodules. These occur in brownish tones inter-layered with white and gray. It is often dyed in various colors for ornamental purposes.
1256: 1470: 1394: 1508: 1032:
Wang, Yifeng; Merino, Enrique (1990-06-01). "Self-organizational origin of agates: Banding, fiber twisting, composition, and dynamic crystallization model".
1432: 1356: 1249:"The formation of agate structures: models for silica transport, agate layer accretion, and for flow patterns and flow regimes in infiltration channels" 672:, and has been recovered at a number of ancient sites, indicating its widespread use in the ancient world; for example, archaeological recovery at the 1853: 814: 1560: 1225: 1502: 1464: 1426: 1388: 1350: 802: 619: 2989: 1825: 1678:
Jiang, CQ; Xiao, LW; Lam, TH; Xie, NW; Zhu, CQ (July 2001). "Accelerated silicosis in workers exposed to agate dust in Guangzhou, China".
1289: 573:
showing an iridescent, internal flash or "fire", the result of a layer of clear agate over a layer of hydrothermally deposited hematite;
2743: 2174: 1533: 1318: 1601: 40:
19.6 kg (43 lb) specimen of "Crazy Lace" agate from Chihuahua, Mexico next to a tennis ball; 38.2 cm (15.0 in) wide
262: 1126: 1077: 653: 1786: 1034: 637: 1580: 149: 796:). Carved in high relief from a single piece of agate, most likely created in an imperial workshop for a Byzantine emperor. 1846: 182: 445:
also displays vegetative features, including fern-like patterns formed due to the presence of manganese and iron oxides.
2696: 2665: 774: 595: 3754: 1715:"Comparison of respiratory morbidity between present and ex-workers of quartz crushing units: Healthy workers' effect" 1248: 357: 1454: 1378: 1492: 3749: 3744: 3200: 2680: 299: 1160: 35: 3036: 2858: 2675: 1839: 1416: 1190:"Agate and chalcedony from igneous and sedimentary hosts aged from 13 to 3480 Ma: a cathodoluminescence study" 479:, such as the Lake Michigan cloud agate, did not form under volcanic processes, but instead formed within the 1340: 1101: 3667: 3041: 2760: 2736: 2167: 1087: 1082: 330: 20: 1554: 3567: 877: 136: 1189: 607: 3404: 3061: 2043: 1201: 1043: 966: 835: 575: 561:
with contrasting concentric banding reminiscent of defensive ditches and walls around ancient forts;
1456:
The Second Book of Crystal Spells: More Magical Uses for Stones, Crystals, Minerals... and Even Salt
3399: 684: 532: 172: 162: 141: 1775: 3739: 2808: 2788: 2729: 2603: 2160: 1217: 735: 688: 295: 126: 378:. These cavities are formed from the gases trapped within the liquid volcanic material forming 3255: 2838: 2033: 1926: 1873: 1746: 1695: 1660: 1498: 1460: 1422: 1384: 1346: 1281: 1059: 739: 669: 567:, a variety found only on the Cuyuna iron range (near Crosby) in Crow Wing County, Minnesota; 379: 118: 1529: 3165: 2994: 2948: 2868: 2670: 2309: 2104: 1736: 1726: 1687: 1650: 1640: 1605: 1310: 1209: 1051: 986: 955: 915: 793: 400: 371: 279: 239: 202: 192: 62: 1828:, School of Natural Resources, University of Nebraska-Lincoln (retrieved 27 December 2014). 3734: 3260: 3195: 3006: 2979: 2709: 2558: 2138: 1959: 1862: 1564: 1247:
Walger, Eckart; Mattheß, Georg; von Seckendorff, Volker; Liebau, Friedrich (August 2009).
891: 728: 408: 76: 718:. Agate is also still used today for decorative displays, cabochons, beads, carvings and 294:
of Greek warriors, while bead necklaces with pierced and polished agate date back to the
1205: 1047: 3613: 3557: 3545: 3474: 3118: 3056: 2833: 2566: 2403: 2114: 1993: 1972: 1741: 1714: 1655: 1628: 996: 920: 863: 723: 722:
art as well as face-polished and tumble-polished specimens of varying size and origin.
528: 490:
is a name given to pale white to tan colored agate found in the former Greek colony of
470: 349: 283: 84: 3728: 3688: 3618: 3577: 3245: 2999: 2984: 2933: 2598: 1055: 715: 658: 627: 585: 453: 375: 275: 212: 113: 1221: 3713: 3708: 3703: 3655: 3608: 3438: 3384: 3170: 3051: 3011: 2903: 2644: 2630: 2626: 2613: 2464: 2209: 2109: 1886: 1576: 857: 839: 662: 549: 311: 527:(also spelled "Holly blue agate"), a rare dark blue ribbon agate found only near 16:
Rock consisting of cryptocrystalline silica alternating with microgranular quartz
3650: 3540: 3379: 3329: 3324: 3240: 3082: 2958: 2908: 2783: 2778: 2470: 2381: 2238: 2038: 981: 950: 789: 318: 222: 3484: 3429: 3304: 3217: 3185: 3175: 3077: 3026: 2963: 2938: 2813: 2618: 2592: 2350: 2344: 2119: 2048: 2015: 1934: 1911: 1906: 1006: 991: 961: 853: 731:, has six windows with panes made of agates collected from the local beaches. 681: 569: 563: 507: 459: 395: 383: 322: 291: 274:, which comes in a wide variety of colors. Agates are primarily formed within 271: 93: 54: 1213: 1063: 3630: 3623: 3494: 3489: 3469: 3394: 3319: 3313: 3294: 3190: 3131: 3046: 2943: 2878: 2853: 2843: 2773: 2752: 2621: 2571: 2503: 2498: 2455: 2409: 2389: 2385: 2286: 2271: 2266: 2198: 2076: 2028: 1967: 1916: 1731: 1645: 1011: 831: 703: 480: 462: 404: 1750: 1699: 1664: 3698: 3672: 3661: 3598: 3525: 3464: 3454: 3449: 3409: 3349: 3339: 3299: 3281: 3270: 3265: 3180: 3136: 3021: 3016: 2953: 2893: 2883: 2848: 2823: 2798: 2793: 2640: 2608: 2587: 2533: 2521: 2475: 2450: 2440: 2398: 2360: 2304: 2261: 2233: 2183: 2099: 2094: 1896: 905: 770: 719: 707: 580: 89: 3693: 3603: 3515: 3424: 3389: 3374: 3359: 3344: 3334: 3207: 3141: 3092: 3031: 2888: 2863: 2828: 2634: 2561: 2445: 2372: 2321: 2228: 2218: 2071: 1891: 1881: 1865: 976: 945: 930: 925: 711: 673: 589:, which contains tiny inclusions of water, sometimes with air bubbles. 511: 367: 326: 287: 1691: 510:. When sliced, it often shows a characteristic layering of concentric 494:
as early as 400 BCE. The Greeks used it for making jewelry and beads.
3593: 3499: 3459: 3434: 3369: 3354: 3250: 3235: 3230: 3146: 3097: 3087: 2803: 2768: 2553: 2516: 2513: 2509: 2393: 2377: 2276: 2086: 1949: 1901: 1152: 935: 755: 699: 491: 387: 338: 315: 1791: 754:
A 6.8 kg (15 lb) barrel full of tumble-polished agate and
1627:
Chaudhury, Nayanjeet; Phatak, Ajay; Paliwal, Rajiv (January 2012).
842:
among workers involved in the agate industry, have been studied in
3572: 3562: 3552: 3535: 3530: 3520: 3479: 3309: 3225: 3157: 2898: 2873: 2818: 2460: 2366: 2356: 2315: 2243: 1998: 1944: 1939: 1831: 1105: 1001: 940: 910: 900: 843: 677: 652: 466: 356: 348: 1629:"Co-morbidities among silicotics at Shakarpur: A follow up study" 426:-like pattern with forms such as eyes, swirls, bands or zigzags. 3444: 3419: 3414: 3364: 3126: 2648: 2582: 2575: 2527: 2326: 2281: 2223: 2192:
Gemmological classifications by E. Ya. Kievlenko (1980), updated
2063: 2053: 1977: 1494:
Iowa's Minerals: Their Occurrence, Origins, Industries, and Lore
1282:"Metaphysical Properties of Yellow Skin Agate - Stone Treasures" 971: 820:
Maryland Agate - Cut and illuminated to show internal structures
695: 423: 2725: 2156: 1835: 1713:
Tiwari, RR; Narain, R; Sharma, YK; Kumar, S (September 2010).
1311:"Agate chalcedony: The mineral Agate information and pictures" 473:, porous rocks and other organic remains can also form agate. 394:
The priming layer is often dark green, but can be modified by
668:
Agate is one of the most common materials used in the art of
2721: 2152: 1078:"Masterpiece of Greek Art Found in the Griffin Warrior Tomb" 557:
containing visible flow channels or pinhole-sized "tubes";
1719:
Indian Journal of Occupational and Environmental Medicine
251: 248: 245: 325:, who discovered the stone along the shore line of the 958: – List of minerals with Knowledge (XXG) articles 694:
The decorative arts use it to make ornaments such as
263: 1801:. Doncaster, S. Yorks, UK: Terra Publications, 1996. 1342:
The Book of Stones: Who They Are and What They Teach
254: 3643: 3586: 3508: 3279: 3216: 3155: 3117: 3110: 3070: 2972: 2926: 2919: 2759: 2658: 2546: 2484: 2431: 2422: 2335: 2295: 2252: 2207: 2197: 2085: 2062: 2014: 2007: 1986: 1958: 1925: 1872: 458:is formed from the shells of fossilized freshwater 242: 221: 211: 201: 191: 181: 171: 161: 148: 135: 125: 112: 104: 99: 83: 61: 50: 45: 28: 687:culture. It has also been used for centuries for 341:, sometime between the 4th and 3rd centuries BCE. 1771:. Bardwin Park, Calif.: Gem Guides Book Co. 2005. 1153:"Agate: Mineral information, data and localities" 773:in niccolo agate, 180-200 CE, found in Tongeren, 769:Gold Roman signet ring with portrait of emperor 1602:"Agate Windows - Community Presbyterian Church" 738:and precision pendulums, and sometimes to make 579:, a red and yellow form of agate only found in 386:, often alternating with layers of crystalline 2737: 2168: 1847: 8: 1794:, Mindat.org, Hudson Institute of Mineralogy 1785:International Colored Gemstone Association, 282:. The ornamental use of agate was common in 430:is found in Africa and is especially hard. 3114: 2923: 2744: 2730: 2722: 2692: 2428: 2204: 2175: 2161: 2153: 2011: 1854: 1840: 1832: 1808:. Buffalo, New York: Firefly Books, 2006. 1799:Agate: Microstructure and Possible Origin 1740: 1730: 1654: 1644: 506:forms in a flat-sided shape similar to a 465:with elongated spiral shells. Similarly, 1815:. 3rd edition. New York: Sterling, 2006. 1377:Atkinson, Bill; Ackerman, Diane (2004). 1339:Simmons, Robert; Ahsian, Naisha (2007). 1767:Cross, Brad L. and Zeitner, June Culp. 1680:American Journal of Industrial Medicine 1024: 744: 591: 370:Eon. Agates are most commonly found as 1577:"Background Article on Idar Oberstein" 25: 1276: 1274: 1183: 1181: 1179: 1177: 7: 1421:. Sterling Publishing Company, Inc. 1228:from the original on March 13, 2022 1133:from the original on 26 August 2023 14: 1259:from the original on June 4, 2018 2703: 2691: 2132: 1782:, Volume 12, pages 383–395, 1927 884: 870: 856: 813: 801: 781: 762: 747: 636: 618: 606: 594: 310:The stone was given its name by 238: 34: 2305:Yellow, Green, Violet Sapphires 1583:from the original on 2008-12-23 1536:from the original on 2022-07-01 1511:from the original on 2023-08-26 1473:from the original on 2023-08-26 1435:from the original on 2023-08-26 1397:from the original on 2023-08-26 1359:from the original on 2023-08-26 1321:from the original on 2020-03-16 1292:from the original on 2020-02-26 1163:from the original on 2020-02-15 1035:Geochimica et Cosmochimica Acta 808:Victorian banded agate earrings 1806:Agates: Treasures of the Earth 1: 1380:Within the Stone: Photography 830:Respiratory diseases such as 775:Gallo-Roman Museum (Tongeren) 523:Other forms of agate include 422:is a variety that exhibits a 2697:List of gemstones by species 2666:List of individual gemstones 2327:Precious White and Fire Opal 1776:"The Nomenclature of Silica" 1762:General and cited references 1497:. University of Iowa Press. 1056:10.1016/0016-7037(90)90396-3 742:to crush and mix chemicals. 1491:Garvin, Paul (2010-09-13). 1453:Grant, Ember (2016-06-08). 1286:Stone Treasures by the Lake 270:) is the banded variety of 3771: 1769:Geodes: Nature's Treasures 334: 18: 3681: 2689: 2681:List of sapphires by size 2190: 2128: 1415:Schumann, Walter (2009). 1383:. BrownTrout Publishers. 300:Indus Valley civilisation 33: 2676:List of emeralds by size 1553:C. Michael Hogan. 2007. 1345:. North Atlantic Books. 1214:10.1180/0026461067050347 680:illustrates its role in 345:Formation and properties 3246:Nickel silver (alpacca) 1732:10.4103/0019-5278.75695 1646:10.4103/0970-2113.92348 1459:. Llewellyn Worldwide. 1088:Smithsonian Institution 374:within the cavities of 144:, with very sharp edges 1813:Gemstones of the World 1804:Pabian, Roger, et al. 1787:"Agate: banded beauty" 1418:Gemstones of the World 1253:www.ingentaconnect.com 1194:Mineralogical Magazine 665: 362: 354: 21:Agate (disambiguation) 3587:Other natural objects 2244:Natural marine pearls 1780:American Mineralogist 878:Earth sciences portal 656: 360: 352: 3062:Wire wrapped jewelry 3042:Repoussé and chasing 2363:, pink, yellow-green 1558:, Modern Antiquarian 625:"Turritella agate" ( 576:Patuxent River stone 539:(has reddish hues); 19:For other uses, see 3604:Ebonite (vulcanite) 2710:Minerals portal 2282:Precious Black Opal 2139:Minerals portal 1206:2006MinM...70..485M 1102:"Agate Creek Agate" 1048:1990GeCoA..54.1627W 740:mortars and pestles 736:laboratory balances 559:fortification agate 533:Lake Superior agate 3755:Symbols of Florida 2949:Jewellery designer 2532:Opaque iridescent 2423:Jewelry-Industrial 2369:yellow, blue, pink 1811:Schumann, Walter. 1563:2018-07-11 at the 1556:Knossos fieldnotes 1090:. 7 November 2017. 702:or other types of 689:leather burnishing 666: 363: 355: 296:3rd millennium BCE 217:up to +0.004 (B-G) 3750:Silicate minerals 3745:Hardstone carving 3722: 3721: 3639: 3638: 3509:Organic gemstones 3106: 3105: 2719: 2718: 2547:Industrial stones 2542: 2541: 2418: 2417: 2150: 2149: 2146: 2145: 2034:Chrome chalcedony 2008:Notable varieties 1927:Cryptocrystalline 1692:10.1002/ajim.1074 1504:978-1-60938-014-4 1466:978-0-7387-4844-3 1428:978-1-4027-6829-3 1390:978-0-7631-8189-5 1352:978-1-55643-668-0 1288:. 24 March 2019. 1188:T, Moxon (2006). 670:hardstone carving 525:Holley blue agate 504:Polyhedroid agate 432:Crazy lace agate, 401:sedimentary rocks 280:metamorphic rocks 231: 230: 119:Cryptocrystalline 3762: 3166:Britannia silver 3115: 2924: 2746: 2739: 2732: 2723: 2708: 2707: 2706: 2695: 2694: 2671:List of diamonds 2429: 2205: 2177: 2170: 2163: 2154: 2137: 2136: 2135: 2105:Herkimer diamond 2012: 1856: 1849: 1842: 1833: 1755: 1754: 1744: 1734: 1710: 1704: 1703: 1675: 1669: 1668: 1658: 1648: 1624: 1618: 1617: 1615: 1613: 1604:. Archived from 1598: 1592: 1591: 1589: 1588: 1573: 1567: 1551: 1545: 1544: 1542: 1541: 1526: 1520: 1519: 1517: 1516: 1488: 1482: 1481: 1479: 1478: 1450: 1444: 1443: 1441: 1440: 1412: 1406: 1405: 1403: 1402: 1374: 1368: 1367: 1365: 1364: 1336: 1330: 1329: 1327: 1326: 1315:www.minerals.net 1307: 1301: 1300: 1298: 1297: 1278: 1269: 1268: 1266: 1264: 1244: 1238: 1237: 1235: 1233: 1185: 1172: 1171: 1169: 1168: 1149: 1143: 1142: 1140: 1138: 1123: 1117: 1116: 1114: 1113: 1104:. Archived from 1098: 1092: 1091: 1074: 1068: 1067: 1042:(6): 1627–1638. 1029: 987:Swiss Blue Topaz 956:List of minerals 894: 889: 888: 887: 880: 875: 874: 873: 866: 861: 860: 817: 805: 794:Byzantine Empire 785: 766: 751: 706:, paper knives, 643:Crazy lace agate 640: 622: 610: 598: 477:Coldwater agates 449:Turritella agate 336: 266: 261: 260: 257: 256: 253: 250: 247: 244: 203:Refractive index 193:Specific gravity 154: 68: 67:(repeating unit) 38: 26: 3770: 3769: 3765: 3764: 3763: 3761: 3760: 3759: 3725: 3724: 3723: 3718: 3677: 3635: 3624:Spondylus shell 3582: 3504: 3275: 3261:Stainless steel 3212: 3196:Sterling silver 3156:Precious metal 3151: 3119:Precious metals 3102: 3066: 2968: 2915: 2755: 2750: 2720: 2715: 2704: 2702: 2685: 2654: 2538: 2480: 2424: 2414: 2331: 2291: 2248: 2193: 2186: 2181: 2151: 2142: 2133: 2131: 2124: 2081: 2058: 2003: 1982: 1954: 1921: 1868: 1860: 1822: 1764: 1759: 1758: 1712: 1711: 1707: 1677: 1676: 1672: 1626: 1625: 1621: 1611: 1609: 1608:on 1 March 2012 1600: 1599: 1595: 1586: 1584: 1575: 1574: 1570: 1565:Wayback Machine 1552: 1548: 1539: 1537: 1528: 1527: 1523: 1514: 1512: 1505: 1490: 1489: 1485: 1476: 1474: 1467: 1452: 1451: 1447: 1438: 1436: 1429: 1414: 1413: 1409: 1400: 1398: 1391: 1376: 1375: 1371: 1362: 1360: 1353: 1338: 1337: 1333: 1324: 1322: 1309: 1308: 1304: 1295: 1293: 1280: 1279: 1272: 1262: 1260: 1246: 1245: 1241: 1231: 1229: 1187: 1186: 1175: 1166: 1164: 1151: 1150: 1146: 1136: 1134: 1125: 1124: 1120: 1111: 1109: 1108:on 16 July 2007 1100: 1099: 1095: 1076: 1075: 1071: 1031: 1030: 1026: 1021: 1016: 892:Minerals portal 890: 885: 883: 876: 871: 869: 862: 855: 852: 834:, and a higher 828: 821: 818: 809: 806: 797: 786: 777: 767: 758: 752: 729:Yachats, Oregon 651: 644: 641: 632: 623: 614: 613:Dendritic agate 611: 602: 599: 537:Carnelian agate 498:Brazilian agate 443:Dendritic agate 428:Blue lace agate 417: 347: 308: 264: 241: 237: 152: 77:silicon dioxide 74: 66: 65: 41: 24: 17: 12: 11: 5: 3768: 3766: 3758: 3757: 3752: 3747: 3742: 3737: 3727: 3726: 3720: 3719: 3717: 3716: 3711: 3706: 3701: 3696: 3691: 3686: 3685:Related topics 3682: 3679: 3678: 3676: 3675: 3670: 3665: 3659: 3653: 3647: 3645: 3641: 3640: 3637: 3636: 3634: 3633: 3628: 3627: 3626: 3616: 3611: 3606: 3601: 3596: 3590: 3588: 3584: 3583: 3581: 3580: 3575: 3570: 3565: 3560: 3555: 3550: 3549: 3548: 3543: 3533: 3528: 3523: 3518: 3512: 3510: 3506: 3505: 3503: 3502: 3497: 3492: 3487: 3482: 3477: 3472: 3467: 3462: 3457: 3452: 3447: 3442: 3432: 3427: 3422: 3417: 3412: 3407: 3402: 3397: 3392: 3387: 3382: 3377: 3372: 3367: 3362: 3357: 3352: 3347: 3342: 3337: 3332: 3327: 3322: 3317: 3307: 3302: 3297: 3292: 3286: 3284: 3277: 3276: 3274: 3273: 3268: 3263: 3258: 3253: 3248: 3243: 3238: 3233: 3228: 3222: 3220: 3214: 3213: 3211: 3210: 3205: 3204: 3203: 3193: 3188: 3183: 3178: 3173: 3168: 3162: 3160: 3153: 3152: 3150: 3149: 3144: 3139: 3134: 3129: 3123: 3121: 3112: 3108: 3107: 3104: 3103: 3101: 3100: 3095: 3090: 3085: 3080: 3074: 3072: 3068: 3067: 3065: 3064: 3059: 3057:Wire sculpture 3054: 3049: 3044: 3039: 3034: 3029: 3024: 3019: 3014: 3009: 3004: 3003: 3002: 2997: 2992: 2982: 2976: 2974: 2970: 2969: 2967: 2966: 2961: 2956: 2951: 2946: 2941: 2936: 2930: 2928: 2921: 2917: 2916: 2914: 2913: 2912: 2911: 2906: 2896: 2891: 2886: 2881: 2876: 2871: 2866: 2861: 2856: 2851: 2846: 2841: 2836: 2831: 2826: 2821: 2816: 2811: 2806: 2801: 2796: 2791: 2786: 2781: 2776: 2771: 2765: 2763: 2757: 2756: 2751: 2749: 2748: 2741: 2734: 2726: 2717: 2716: 2714: 2713: 2690: 2687: 2686: 2684: 2683: 2678: 2673: 2668: 2662: 2660: 2656: 2655: 2653: 2652: 2638: 2624: 2616: 2611: 2606: 2601: 2596: 2590: 2585: 2579: 2569: 2567:Petrified wood 2564: 2556: 2550: 2548: 2544: 2543: 2540: 2539: 2537: 2536: 2530: 2524: 2519: 2506: 2501: 2496: 2490: 2488: 2482: 2481: 2479: 2478: 2473: 2468: 2458: 2453: 2448: 2443: 2437: 2435: 2426: 2420: 2419: 2416: 2415: 2413: 2412: 2406: 2401: 2396: 2375: 2370: 2364: 2354: 2353:, polychromous 2348: 2341: 2339: 2333: 2332: 2330: 2329: 2324: 2319: 2312: 2307: 2301: 2299: 2293: 2292: 2290: 2289: 2284: 2279: 2274: 2269: 2264: 2258: 2256: 2250: 2249: 2247: 2246: 2241: 2236: 2231: 2226: 2221: 2215: 2213: 2202: 2195: 2194: 2191: 2188: 2187: 2182: 2180: 2179: 2172: 2165: 2157: 2148: 2147: 2144: 2143: 2129: 2126: 2125: 2123: 2122: 2117: 2115:Shocked quartz 2112: 2107: 2102: 2097: 2091: 2089: 2083: 2082: 2080: 2079: 2074: 2068: 2066: 2060: 2059: 2057: 2056: 2051: 2046: 2041: 2036: 2031: 2026: 2020: 2018: 2009: 2005: 2004: 2002: 2001: 1996: 1990: 1988: 1984: 1983: 1981: 1980: 1975: 1973:Lechatelierite 1970: 1964: 1962: 1956: 1955: 1953: 1952: 1947: 1942: 1937: 1931: 1929: 1923: 1922: 1920: 1919: 1914: 1909: 1904: 1899: 1894: 1889: 1884: 1878: 1876: 1870: 1869: 1861: 1859: 1858: 1851: 1844: 1836: 1830: 1829: 1821: 1820:External links 1818: 1817: 1816: 1809: 1802: 1797:Moxon, Terry. 1795: 1789: 1783: 1774:Hart, Gilbert 1772: 1763: 1760: 1757: 1756: 1705: 1670: 1619: 1593: 1568: 1546: 1521: 1503: 1483: 1465: 1445: 1427: 1407: 1389: 1369: 1351: 1331: 1302: 1270: 1239: 1200:(5): 485–498. 1173: 1157:www.mindat.org 1144: 1118: 1093: 1069: 1023: 1022: 1020: 1017: 1015: 1014: 1009: 1004: 999: 994: 989: 984: 979: 974: 969: 964: 959: 953: 948: 943: 938: 933: 928: 923: 918: 913: 908: 903: 897: 896: 895: 881: 867: 864:Geology portal 851: 848: 827: 824: 823: 822: 819: 812: 810: 807: 800: 798: 787: 780: 778: 768: 761: 759: 753: 746: 724:Idar-Oberstein 650: 647: 646: 645: 642: 635: 633: 624: 617: 615: 612: 605: 603: 601:Agatized coral 600: 593: 541:Botswana agate 529:Holley, Oregon 471:petrified wood 416: 413: 403:, normally in 376:volcanic rocks 353:Botswana agate 346: 343: 307: 304: 286:, in assorted 284:Ancient Greece 229: 228: 225: 219: 218: 215: 209: 208: 205: 199: 198: 195: 189: 188: 185: 179: 178: 175: 169: 168: 165: 159: 158: 155: 146: 145: 139: 133: 132: 129: 123: 122: 116: 110: 109: 106: 102: 101: 100:Identification 97: 96: 87: 85:Crystal system 81: 80: 72: 69: 59: 58: 52: 48: 47: 43: 42: 39: 31: 30: 15: 13: 10: 9: 6: 4: 3: 2: 3767: 3756: 3753: 3751: 3748: 3746: 3743: 3741: 3738: 3736: 3733: 3732: 3730: 3715: 3712: 3710: 3707: 3705: 3702: 3700: 3697: 3695: 3692: 3690: 3689:Body piercing 3687: 3684: 3683: 3680: 3674: 3671: 3669: 3666: 3663: 3660: 3657: 3654: 3652: 3649: 3648: 3646: 3642: 3632: 3629: 3625: 3622: 3621: 3620: 3617: 3615: 3612: 3610: 3607: 3605: 3602: 3600: 3597: 3595: 3592: 3591: 3589: 3585: 3579: 3578:Tortoiseshell 3576: 3574: 3571: 3569: 3566: 3564: 3561: 3559: 3556: 3554: 3551: 3547: 3544: 3542: 3539: 3538: 3537: 3534: 3532: 3529: 3527: 3524: 3522: 3519: 3517: 3514: 3513: 3511: 3507: 3501: 3498: 3496: 3493: 3491: 3488: 3486: 3483: 3481: 3478: 3476: 3473: 3471: 3468: 3466: 3463: 3461: 3458: 3456: 3453: 3451: 3448: 3446: 3443: 3440: 3436: 3433: 3431: 3428: 3426: 3423: 3421: 3418: 3416: 3413: 3411: 3408: 3406: 3403: 3401: 3398: 3396: 3393: 3391: 3388: 3386: 3383: 3381: 3378: 3376: 3373: 3371: 3368: 3366: 3363: 3361: 3358: 3356: 3353: 3351: 3348: 3346: 3343: 3341: 3338: 3336: 3333: 3331: 3328: 3326: 3323: 3321: 3318: 3315: 3311: 3308: 3306: 3303: 3301: 3298: 3296: 3293: 3291: 3288: 3287: 3285: 3283: 3278: 3272: 3269: 3267: 3264: 3262: 3259: 3257: 3254: 3252: 3249: 3247: 3244: 3242: 3239: 3237: 3234: 3232: 3229: 3227: 3224: 3223: 3221: 3219: 3215: 3209: 3206: 3202: 3199: 3198: 3197: 3194: 3192: 3189: 3187: 3184: 3182: 3179: 3177: 3174: 3172: 3169: 3167: 3164: 3163: 3161: 3159: 3154: 3148: 3145: 3143: 3140: 3138: 3135: 3133: 3130: 3128: 3125: 3124: 3122: 3120: 3116: 3113: 3109: 3099: 3096: 3094: 3091: 3089: 3086: 3084: 3081: 3079: 3076: 3075: 3073: 3069: 3063: 3060: 3058: 3055: 3053: 3050: 3048: 3045: 3043: 3040: 3038: 3035: 3033: 3030: 3028: 3025: 3023: 3020: 3018: 3015: 3013: 3010: 3008: 3005: 3001: 2998: 2996: 2993: 2991: 2988: 2987: 2986: 2983: 2981: 2978: 2977: 2975: 2971: 2965: 2962: 2960: 2957: 2955: 2952: 2950: 2947: 2945: 2942: 2940: 2937: 2935: 2934:Bench jeweler 2932: 2931: 2929: 2925: 2922: 2918: 2910: 2907: 2905: 2902: 2901: 2900: 2897: 2895: 2892: 2890: 2887: 2885: 2882: 2880: 2877: 2875: 2872: 2870: 2867: 2865: 2862: 2860: 2857: 2855: 2852: 2850: 2847: 2845: 2842: 2840: 2837: 2835: 2832: 2830: 2827: 2825: 2822: 2820: 2817: 2815: 2812: 2810: 2807: 2805: 2802: 2800: 2797: 2795: 2792: 2790: 2787: 2785: 2782: 2780: 2777: 2775: 2772: 2770: 2767: 2766: 2764: 2762: 2758: 2754: 2747: 2742: 2740: 2735: 2733: 2728: 2727: 2724: 2712: 2711: 2700: 2699: 2698: 2688: 2682: 2679: 2677: 2674: 2672: 2669: 2667: 2664: 2663: 2661: 2657: 2650: 2646: 2642: 2639: 2636: 2632: 2628: 2625: 2623: 2620: 2617: 2615: 2612: 2610: 2607: 2605: 2602: 2600: 2597: 2594: 2591: 2589: 2586: 2584: 2580: 2577: 2573: 2570: 2568: 2565: 2563: 2560: 2557: 2555: 2552: 2551: 2549: 2545: 2535: 2531: 2529: 2525: 2523: 2520: 2518: 2515: 2511: 2507: 2505: 2502: 2500: 2497: 2495: 2492: 2491: 2489: 2487: 2483: 2477: 2474: 2472: 2469: 2466: 2462: 2459: 2457: 2454: 2452: 2449: 2447: 2444: 2442: 2439: 2438: 2436: 2434: 2430: 2427: 2421: 2411: 2407: 2405: 2402: 2400: 2397: 2395: 2391: 2387: 2383: 2379: 2376: 2374: 2371: 2368: 2365: 2362: 2358: 2355: 2352: 2349: 2346: 2343: 2342: 2340: 2338: 2334: 2328: 2325: 2323: 2320: 2317: 2313: 2311: 2308: 2306: 2303: 2302: 2300: 2298: 2294: 2288: 2285: 2283: 2280: 2278: 2275: 2273: 2270: 2268: 2265: 2263: 2262:Pink sapphire 2260: 2259: 2257: 2255: 2251: 2245: 2242: 2240: 2237: 2235: 2234:Blue Sapphire 2232: 2230: 2227: 2225: 2222: 2220: 2217: 2216: 2214: 2212: 2211: 2206: 2203: 2200: 2196: 2189: 2185: 2178: 2173: 2171: 2166: 2164: 2159: 2158: 2155: 2141: 2140: 2127: 2121: 2118: 2116: 2113: 2111: 2108: 2106: 2103: 2101: 2098: 2096: 2093: 2092: 2090: 2088: 2084: 2078: 2075: 2073: 2070: 2069: 2067: 2065: 2061: 2055: 2052: 2050: 2047: 2045: 2042: 2040: 2037: 2035: 2032: 2030: 2027: 2025: 2022: 2021: 2019: 2017: 2013: 2010: 2006: 2000: 1997: 1995: 1992: 1991: 1989: 1987:Miscellaneous 1985: 1979: 1976: 1974: 1971: 1969: 1966: 1965: 1963: 1961: 1957: 1951: 1948: 1946: 1943: 1941: 1938: 1936: 1933: 1932: 1930: 1928: 1924: 1918: 1915: 1913: 1910: 1908: 1905: 1903: 1900: 1898: 1895: 1893: 1890: 1888: 1885: 1883: 1880: 1879: 1877: 1875: 1871: 1867: 1864: 1857: 1852: 1850: 1845: 1843: 1838: 1837: 1834: 1827: 1824: 1823: 1819: 1814: 1810: 1807: 1803: 1800: 1796: 1793: 1790: 1788: 1784: 1781: 1777: 1773: 1770: 1766: 1765: 1761: 1752: 1748: 1743: 1738: 1733: 1728: 1724: 1720: 1716: 1709: 1706: 1701: 1697: 1693: 1689: 1685: 1681: 1674: 1671: 1666: 1662: 1657: 1652: 1647: 1642: 1638: 1634: 1630: 1623: 1620: 1607: 1603: 1597: 1594: 1582: 1578: 1572: 1569: 1566: 1562: 1559: 1557: 1550: 1547: 1535: 1531: 1525: 1522: 1510: 1506: 1500: 1496: 1495: 1487: 1484: 1472: 1468: 1462: 1458: 1457: 1449: 1446: 1434: 1430: 1424: 1420: 1419: 1411: 1408: 1396: 1392: 1386: 1382: 1381: 1373: 1370: 1358: 1354: 1348: 1344: 1343: 1335: 1332: 1320: 1316: 1312: 1306: 1303: 1291: 1287: 1283: 1277: 1275: 1271: 1258: 1254: 1250: 1243: 1240: 1227: 1223: 1219: 1215: 1211: 1207: 1203: 1199: 1195: 1191: 1184: 1182: 1180: 1178: 1174: 1162: 1158: 1154: 1148: 1145: 1132: 1128: 1122: 1119: 1107: 1103: 1097: 1094: 1089: 1085: 1084: 1079: 1073: 1070: 1065: 1061: 1057: 1053: 1049: 1045: 1041: 1037: 1036: 1028: 1025: 1018: 1013: 1010: 1008: 1005: 1003: 1000: 998: 995: 993: 990: 988: 985: 983: 980: 978: 975: 973: 970: 968: 965: 963: 960: 957: 954: 952: 949: 947: 944: 942: 939: 937: 934: 932: 929: 927: 924: 922: 919: 917: 914: 912: 909: 907: 904: 902: 899: 898: 893: 882: 879: 868: 865: 859: 854: 849: 847: 845: 841: 837: 833: 826:Health impact 825: 816: 811: 804: 799: 795: 791: 784: 779: 776: 772: 765: 760: 757: 750: 745: 743: 741: 737: 732: 730: 725: 721: 717: 713: 709: 705: 701: 697: 692: 690: 686: 683: 679: 675: 671: 664: 660: 659:drinking horn 655: 648: 639: 634: 630: 629: 628:Elimia tenera 621: 616: 609: 604: 597: 592: 590: 588: 587: 586:enhydro agate 582: 578: 577: 572: 571: 566: 565: 560: 556: 552: 551: 546: 542: 538: 534: 530: 526: 521: 519: 515: 513: 509: 505: 501: 499: 495: 493: 489: 485: 482: 478: 474: 472: 468: 464: 461: 457: 455: 454:Elimia tenera 450: 446: 444: 440: 436: 433: 429: 425: 421: 414: 412: 410: 406: 402: 397: 392: 389: 385: 381: 377: 373: 369: 359: 351: 344: 342: 340: 332: 331:Ancient Greek 328: 327:Dirillo River 324: 320: 317: 313: 305: 303: 301: 297: 293: 289: 285: 281: 277: 273: 269: 268: 259: 235: 226: 224: 220: 216: 214: 213:Birefringence 210: 206: 204: 200: 196: 194: 190: 186: 184: 180: 176: 174: 170: 166: 164: 160: 156: 151: 147: 143: 140: 138: 134: 130: 128: 124: 120: 117: 115: 114:Crystal habit 111: 107: 103: 98: 95: 91: 88: 86: 82: 78: 70: 64: 60: 56: 53: 49: 44: 37: 32: 27: 22: 3714:Wearable art 3709:Phaleristics 3704:Metalworking 3609:Gutta-percha 3385:Lapis lazuli 3289: 3171:Colored gold 3052:Stonesetting 2701: 2645:Pyrophyllite 2614:Serpentinite 2595:(green mica) 2493: 2485: 2465:Baltic amber 2432: 2336: 2296: 2253: 2208: 2130: 2110:Smoky quartz 2023: 1887:Cristobalite 1812: 1805: 1798: 1779: 1768: 1725:(3): 87–90. 1722: 1718: 1708: 1686:(1): 87–91. 1683: 1679: 1673: 1636: 1632: 1622: 1612:19 September 1610:. Retrieved 1606:the original 1596: 1585:. Retrieved 1571: 1555: 1549: 1538:. Retrieved 1530:"Iris Agate" 1524: 1513:. Retrieved 1493: 1486: 1475:. Retrieved 1455: 1448: 1437:. Retrieved 1417: 1410: 1399:. Retrieved 1379: 1372: 1361:. Retrieved 1341: 1334: 1323:. Retrieved 1314: 1305: 1294:. Retrieved 1285: 1261:. Retrieved 1252: 1242: 1230:. Retrieved 1197: 1193: 1165:. Retrieved 1156: 1147: 1137:19 September 1135:. Retrieved 1121: 1110:. Retrieved 1106:the original 1096: 1081: 1072: 1039: 1033: 1027: 840:tuberculosis 829: 733: 693: 667: 663:Tang dynasty 626: 584: 574: 568: 562: 558: 554: 550:condor agate 548: 544: 540: 536: 524: 522: 517: 516: 503: 502: 497: 496: 487: 486: 476: 475: 452: 448: 447: 442: 438: 437: 431: 427: 419: 418: 393: 364: 361:Hollow agate 329:or Achates ( 312:Theophrastus 309: 233: 232: 3651:Art jewelry 3475:Tiger's eye 3380:Labradorite 3330:Chrysocolla 3325:Chrysoberyl 3241:Mokume-gane 3218:Base metals 2990:centrifugal 2959:Silversmith 2834:Ferronnière 2784:Belt buckle 2779:Belly chain 2627:Ophicalcite 2508:Colorless, 2471:Chrysoprase 2382:Spessartine 2347:– Verdelite 2239:Alexandrite 2039:Chrysoprase 1994:Tiger's eye 1874:Crystalline 1639:(1): 6–10. 1083:Smithsonian 997:Tiger's Eye 982:Rose Quartz 951:Labradorite 846:and China. 790:Rubens Vase 545:plume agate 488:Greek agate 319:philosopher 292:seal stones 290:and in the 223:Pleochroism 207:1.530–1.540 187:Translucent 183:Diaphaneity 3729:Categories 3485:Tourmaline 3430:Prasiolite 3305:Aventurine 3176:Crown gold 3078:Draw plate 3027:Metal clay 2964:Watchmaker 2954:Lapidarist 2939:Clockmaker 2814:Collar pin 2809:Chatelaine 2631:Serpentine 2619:Aventurine 2593:Listwanite 2384:(malaya), 2351:Indicolite 2345:Tourmaline 2318:(Imperial) 2310:Aquamarine 2120:Prasiolite 2049:Moss agate 2044:Heliotrope 2016:Chalcedony 1935:Chalcedony 1912:Stishovite 1907:Seifertite 1633:Lung India 1587:2008-11-27 1540:2022-05-27 1515:2020-10-29 1477:2020-10-29 1439:2020-10-29 1401:2020-10-29 1363:2020-10-29 1325:2020-02-27 1296:2020-02-27 1232:October 1, 1167:2020-02-11 1112:2007-07-01 1007:Tourmaline 992:Thunderegg 962:Lithophysa 916:Aquamarine 682:Bronze Age 570:fire agate 564:Binghamite 555:tube agate 518:Iris agate 508:polyhedron 463:gastropods 460:Turritella 439:Moss agate 420:Lace agate 396:iron oxide 384:chalcedony 323:naturalist 272:chalcedony 150:Mohs scale 142:Conchoidal 94:monoclinic 55:Chalcedony 3740:Gemstones 3631:Toadstone 3568:Operculum 3495:Variscite 3490:Turquoise 3470:Tanzanite 3405:Moonstone 3400:Marcasite 3395:Malachite 3320:Carnelian 3295:Amazonite 3282:gemstones 3256:Pinchbeck 3201:Argentium 3191:Shibuichi 3132:Palladium 3111:Materials 3047:Soldering 3037:Polishing 3012:Engraving 3007:Enameling 2973:Processes 2944:Goldsmith 2879:Tie chain 2854:Neck ring 2844:Lapel pin 2753:Jewellery 2622:quartzite 2574:(Porouse 2572:Cacholong 2534:feldspars 2504:Rhodonite 2499:Amazonite 2486:2nd order 2456:Malachite 2433:1st order 2410:Turquoise 2390:Almandine 2386:Rhodolite 2337:4th order 2297:3rd order 2287:Tanzanite 2272:Tsavorite 2267:Demantoid 2254:2nd order 2210:1st order 2184:Gemstones 2077:Geyserite 2029:Carnelian 1968:Fulgurite 1960:Amorphous 1917:Tridymite 1127:"Achates" 1064:0016-7037 1019:Citations 1012:Turquoise 967:Moonstone 836:incidence 832:silicosis 708:inkstands 704:jewellery 481:limestone 405:limestone 306:Etymology 197:2.58–2.64 3699:Gemology 3673:Fineness 3664:(purity) 3599:Bog-wood 3546:Precious 3526:Ammolite 3465:Sunstone 3455:Sodalite 3450:Sapphire 3410:Obsidian 3350:Fluorite 3340:Diopside 3300:Amethyst 3280:Mineral 3271:Tungsten 3266:Titanium 3181:Electrum 3137:Platinum 3022:Kazaziye 3017:Filigree 2995:lost-wax 2894:Toe ring 2884:Tie clip 2859:Pectoral 2849:Necklace 2824:Cufflink 2799:Bracelet 2794:Bolo tie 2774:Barrette 2641:Pagodite 2609:Fluorite 2604:Selenite 2588:Obsidian 2522:Hematite 2476:Charoite 2451:Nephrite 2441:Lazurite 2399:Amethyst 2361:Heliodor 2100:Ametrine 2095:Amethyst 1897:Moganite 1866:minerals 1826:"Agates" 1751:21461160 1700:11439400 1665:22345906 1581:Archived 1561:Archived 1534:Archived 1509:Archived 1471:Archived 1433:Archived 1395:Archived 1357:Archived 1319:Archived 1290:Archived 1263:March 3, 1257:Archived 1226:Archived 1222:54607138 1161:Archived 1131:Archived 906:Amethyst 850:See also 771:Commodus 720:Intarsia 700:brooches 676:site on 581:Maryland 512:polygons 409:dolomite 380:vesicles 276:volcanic 153:hardness 137:Fracture 127:Cleavage 90:Trigonal 51:Category 3694:Fashion 3668:Finding 3516:Abalone 3425:Peridot 3390:Larimar 3375:Kyanite 3360:Howlite 3345:Emerald 3335:Diamond 3208:Tumbaga 3186:Shakudō 3142:Rhodium 3093:Mandrel 3032:Plating 2985:Casting 2980:Carving 2889:Tie pin 2864:Pendant 2839:Genital 2829:Earring 2659:Related 2635:Calcite 2581:Marble 2562:granite 2559:Graphic 2526:Common 2446:Jadeite 2404:Citrine 2378:Garnets 2373:Peridot 2322:Elbaite 2314:Orange 2229:Emerald 2219:Diamond 2199:Jewelry 2072:Fiorite 1892:Keatite 1882:Coesite 1792:"Agate" 1742:3062020 1656:3276038 1202:Bibcode 1044:Bibcode 977:Peridot 946:Kyanite 931:Emerald 926:Diamond 921:Citrine 712:marbles 691:tools. 674:Knossos 372:nodules 368:Archean 298:in the 288:jewelry 63:Formula 57:variety 46:General 3735:Agates 3658:(mass) 3594:Bezoar 3500:Zircon 3460:Spinel 3435:Quartz 3370:Jasper 3355:Garnet 3251:Pewter 3236:Copper 3231:Bronze 3158:alloys 3147:Silver 3098:Pliers 3088:Hammer 3000:vacuum 2927:People 2920:Making 2904:pocket 2804:Brooch 2769:Anklet 2554:Jasper 2517:quartz 2425:stones 2394:Pyrope 2277:Spinel 2201:stones 2087:Quartz 1950:Jasper 1902:Quartz 1863:Silica 1749:  1739:  1698:  1663:  1653:  1501:  1463:  1425:  1387:  1349:  1220:  1062:  936:Garnet 756:jasper 685:Minoan 657:Agate 583:; and 492:Sicily 388:quartz 339:Sicily 335:Ἀχάτης 227:Absent 173:Streak 163:Luster 121:silica 108:banded 3662:Carat 3656:Carat 3644:Terms 3619:Shell 3573:Pearl 3563:Nacre 3553:Ivory 3541:Black 3536:Coral 3531:Copal 3521:Amber 3480:Topaz 3439:smoky 3310:Beryl 3290:Agate 3226:Brass 3071:Tools 2909:strap 2899:Watch 2874:Tiara 2819:Crown 2789:Bindi 2761:Forms 2510:smoky 2494:Agate 2461:Amber 2408:Blue 2367:Topaz 2357:Beryl 2316:topaz 2024:Agate 1999:Aqeeq 1945:Flint 1940:Chert 1218:S2CID 1002:Topaz 941:Geode 911:Aqeeq 901:Amber 844:India 788:The " 716:seals 678:Crete 467:coral 415:Types 337:) in 316:Greek 234:Agate 177:White 157:6.5–7 105:Color 29:Agate 3614:Hair 3445:Ruby 3420:Opal 3415:Onyx 3365:Jade 3127:Gold 3083:File 2869:Ring 2649:Talc 2583:onyx 2576:opal 2528:opal 2514:pink 2512:and 2224:Ruby 2064:Opal 2054:Onyx 1978:Opal 1747:PMID 1696:PMID 1661:PMID 1614:2014 1499:ISBN 1461:ISBN 1423:ISBN 1385:ISBN 1347:ISBN 1265:2020 1234:2006 1139:2014 1060:ISSN 972:Opal 714:and 696:pins 649:Uses 424:lace 321:and 314:, a 278:and 167:Waxy 131:None 3558:Jet 3314:red 2599:Jet 1737:PMC 1727:doi 1688:doi 1651:PMC 1641:doi 1210:doi 1052:doi 838:of 792:" ( 407:or 267:-it 92:or 71:SiO 3731:: 2392:, 2388:, 2380:– 2359:– 1778:, 1745:. 1735:. 1723:14 1721:. 1717:. 1694:. 1684:40 1682:. 1659:. 1649:. 1637:29 1635:. 1631:. 1579:. 1532:. 1507:. 1469:. 1431:. 1393:. 1355:. 1317:. 1313:. 1284:. 1273:^ 1255:. 1251:. 1224:. 1216:. 1208:. 1198:70 1196:. 1192:. 1176:^ 1159:. 1155:. 1129:. 1086:. 1080:. 1058:. 1050:. 1040:54 1038:. 710:, 698:, 661:, 553:; 547:; 543:; 535:; 531:; 469:, 333:: 302:. 265:AG 3441:) 3437:( 3316:) 3312:( 2745:e 2738:t 2731:v 2651:) 2647:/ 2643:( 2637:) 2633:/ 2629:( 2578:) 2467:) 2463:( 2176:e 2169:t 2162:v 1855:e 1848:t 1841:v 1753:. 1729:: 1702:. 1690:: 1667:. 1643:: 1616:. 1590:. 1543:. 1518:. 1480:. 1442:. 1404:. 1366:. 1328:. 1299:. 1267:. 1236:. 1212:: 1204:: 1170:. 1141:. 1115:. 1066:. 1054:: 1046:: 631:) 456:) 451:( 258:/ 255:t 252:ɪ 249:ɡ 246:æ 243:ˈ 240:/ 236:( 79:) 75:( 73:2 23:.

Index

Agate (disambiguation)

Chalcedony
Formula
silicon dioxide
Crystal system
Trigonal
monoclinic
Crystal habit
Cryptocrystalline
Cleavage
Fracture
Conchoidal
Mohs scale
Luster
Streak
Diaphaneity
Specific gravity
Refractive index
Birefringence
Pleochroism
/ˈæɡɪt/
AG-it
chalcedony
volcanic
metamorphic rocks
Ancient Greece
jewelry
seal stones
3rd millennium BCE

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.