Knowledge (XXG)

Chrysoberyl

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they contain inclusions that seem natural. Czochralski or pulled alexandrite is easier to identify because it is very clean and contains curved striations visible under magnification. Although the color change in pulled stones can be from blue to red, the color change does not truly resemble that of natural alexandrite from any deposit. Hydrothermal lab-grown alexandrite has identical physical and chemical properties to real alexandrite.
2182: 825: 786: 861: 40: 852:" today, choosing a stone often boils down to personal preference between its colors in different lights—whether one favors the "emerald by day" or "ruby by night" appearance. For instance, Madagascan alexandrite might appear more brownish than purplish in incandescent light. Ultimately, the beauty of alexandrite is subjective, emphasizing that its allure truly lies in the eye of the beholder. 516: 2170: 1586: 900:
white light normally crossing the cabochon as a center line along its length and overlying the honey-colored background. The honey color is considered to be top-grade by many gemologists but the lemon yellow colors are also popular and attractive. Cat's eye material is found as a small percentage of the overall chrysoberyl production wherever chrysoberyl is found.
880:. Cymophane has its derivation also from the Greek words meaning 'wave' and 'appearance', in reference to the haziness that visually distorts what would normally be viewed as a well defined surface of a cabochon. This effect may be combined with a cat eye effect. In this variety, microscopic tubelike cavities or needle-like inclusions of 729:. Nordenskiöld's initial discovery occurred as a result of an examination of a newly found mineral sample he had received from Perovskii, which he identified as emerald at first. The first emerald mine had been opened in 1831. However, recent research suggests that the stone was discovered by Yakov Kokovin. 474:. However, its most distinctive property is that it also changes color in artificial (tungsten/halogen) light compared to daylight. The color change from red to green is due to strong absorption of light in a narrow yellow portion of the spectrum, while allowing large bands of more blue-green and red 691:
is most sensitive to green light and least sensitive to red light, alexandrite appears greenish in daylight where the full spectrum of visible light is present, and reddish in incandescent light which emits less green and blue light. This color change is independent of any change of hue with viewing
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of solid minerals. The remnant magma thus becomes richer in water, and also in rare elements that similarly do not fit in the crystal structures of major rock-forming minerals. The water extends the temperature range downwards before the magma becomes completely solid, allowing concentration of rare
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gave a ring with a cat's eye as an engagement token; this was sufficient to make the stone more popular and increase its value greatly. Until that time, cat's eye had predominantly been present in gem and mineral collections. The increased demand in turn created an intensified search for it in Sri
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Gems lacking the silky inclusions required to produce the cat's eye effect are usually faceted. An alexandrite cat's eye is a chrysoberyl cat's eye that changes color. "Milk and honey" is a term commonly used to describe the color of the best cat's eyes. The effect refers to the sharp milky ray of
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The color of alexandrite can vary by origin and sometimes helps identify imitations. Generally, the highest quality stones, predominantly green, are found in Africa. Indian alexandrite typically exhibits blue or grassy-green hues in daylight, whereas Sri Lankan stones lean towards yellowish-green.
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lab-grown stones with the same chemical and physical properties as natural alexandrite. Several methods can produce flux-grown alexandrite, Czochralski (or pulled) alexandrite, and hydrothermally-produced alexandrite. Flux-grown gems are fairly difficult to distinguish from natural alexandrite as
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The alexandrite variety displays a color change dependent upon the nature of ambient lighting. Alexandrite results from small scale replacement of aluminium by chromium ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region
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Stones that show a dramatic color change and strong colors (e.g., red-to-green) are rare and sought-after, but stones that show less distinct colors (e.g. yellowish green changing to brownish yellow) may also be considered "alexandrite" by gem labs such as the Gemological Institute of America.
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occur in an orientation parallel to the c-axis, producing a chatoyant effect visible as a single ray of light passing across the crystal. This effect is best seen in gemstones cut in cabochon forms perpendicular to the c-axis. The color in yellow chrysoberyl is due to Fe impurities.
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Named after Czar Alexander II, who is noted for emancipating Russia's serfs, alexandrite had largely been depleted in Russia by the 1890s due to extensive mining. A global rediscovery sparked renewed interest in this remarkable gem, often referred to as a "second-chance stone".
896:, corundum, spinel and quartz can form "cat's eye" stones similar in appearance to cymophane, the jewelry industry designates these stones as "quartz cat's eyes", or "ruby cat's eyes" and only chrysoberyl can be referred to as "cat's eye" with no other designation. 656:
If the pegmatite fluid is rich in beryllium, crystals of beryl or chrysoberyl could form. Beryl has a high ratio of beryllium to aluminium, while the opposite is true for chrysoberyl. Both are stable with the common mineral quartz. For alexandrite to form, some
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pegmatites in which chromium is almost absent. Therefore, the only situation where an alexandrite can grow is when Be-rich pegmatitic fluids react with Cr-rich country rock. This unusual requirement explains the rarity of this chrysoberyl variety.
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marble. Because it is a hard, dense mineral that is resistant to chemical alteration, it can be weathered out of rocks and deposited in river sands and gravels in alluvial deposits with other gem minerals such as diamond, corundum, topaz,
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appearance, but are the result of a triplet of twins with each "twin" oriented at 120° to its neighbors and taking up 120° of the cyclic trilling. If only two of the three possible twin orientations are present, a V-shaped twin results.
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to be transmitted. Which of these prevails to give the perceived hue depends on the spectral balance of the illumination. Fine-quality alexandrite has a green to bluish-green color in daylight (relatively blue illumination of high
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elements to proceed so far that they produce their own distinctive minerals. The resulting rock is igneous in appearance but formed at a low temperature from a water-rich melt, with large crystals of the common minerals such as
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which can rise upwards towards the surface. As the main magma body cools, water originally present in low concentrations became more concentrated in the molten rock because it could not be incorporated into the
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Various shades of green, emerald-green yellow, blue, brownish to greenish black, may be raspberry-red under incandescent light when chromian; colorless, pale shades of yellow, green, or red in transmitted
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Alexandrite 5 carats (1,000 mg) and larger were traditionally thought to be found only in the Ural Mountains, but have since been found in larger sizes in Brazil. Other deposits are located in
614:. The high water content of the magma made it possible for the crystals to grow quickly, so pegmatite crystals are often quite large, which increases the likelihood of gem specimens forming. 1591: 990: 487:(relatively yellow illumination). However, fine-color material is extremely rare. Less-desirable stones may have daylight colors of yellowish-green and incandescent colors of brownish red. 1379: 776:
material has been around for almost 100 years and shows a characteristic purple-mauve colour change, which does not really look like alexandrite because there is never any green.
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are two completely different gemstones, although they both contain beryllium. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the
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Xie, Fei; Cao, Yu; Ranchon, Cindy; Hart, Alan; Hansen, Robin; Post, Jeffrey E.; Whitney, Coralyn W.; Dawson-Tarr, Emma; Drew, Alan J.; Dunstan, David J. (April 9, 2020).
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Xie, Fei; Cao, Yu; Ranchon, Cindy; Hart, Alan; Hansen, Robin; Post, Jeffrey E.; Whitney, Coralyn W.; Dawson-Tarr, Emma; Drew, Alan J.; Dunstan, David J. (April 9, 2020).
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Alexandrit oder Ural Chrysoberyll // Schriften der St.-Petersburg geschrifteten Russisch-Kaiserlichen Gesellschaft fuer die gesammte Mineralogie. 1842. Bd 1. S. 116–127.
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would also have had to be present. However, beryllium and chromium do not tend to occur in the same types of rock. Chromium is most common in
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in Russia can be green by daylight and red by incandescent light. Other varieties of alexandrite may be yellowish or pink in daylight and a
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near to pegmatites, when Be- and Al-rich fluids from the pegmatite react with surrounding minerals. Hence, it can be found in
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Alexandrite step cut cushion, 26.75 cts. This stone is bluish green in daylight and purple red under incandescent light
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Sri Lankan alexandrites are often larger but tend to have a weaker color change, displaying a softer purple at night.
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According to a popular but controversial story, alexandrite was discovered by the Finnish mineralogist
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and Edwardian eras, which caused confusion since that name has also been used for the mineral
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and are not actually chrysoberyl. As a result, they would be more accurately described as
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is recovered from placers, as the host rocks have been intensely weathered and eroded.
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Cat's eye became significantly more popular by the end of the 19th century when the
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green, red and orange-yellow colors depending on viewing direction in partially
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Contact and penetration twins common, often repeated forming rosette structures
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rocks in which beryllium is extremely rare. Beryllium becomes concentrated in
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Cymophane is popularly known as "cat's eye". This variety exhibits pleasing
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was created from a revision of this article dated 26 March 2015
1406:""Alexandrite or Diaphanite?". In Alexandrite Tsarstone Collectors Guide" 773: 761: 757: 658: 599: 499: 405: 354: 306: 963: 938: 3170: 3080: 2992: 2901: 2866: 2851: 2836: 2821: 2811: 2684: 2618: 2569: 2508: 2365: 2340: 2305: 2111: 2038: 1922: 1849: 1798: 1705: 1695: 1105:. Vol. 6 (11th ed.). Cambridge University Press. p. 320. 625: 607: 603: 467: 452: 448: 424: 1030: 860: 443:. Yellow-green chrysoberyl was referred to as "chrysolite" during the 3070: 2976: 2936: 2911: 2846: 2831: 2727: 2712: 2707: 2623: 2574: 2564: 2280: 2245: 2030: 1993: 1990: 1986: 1870: 1854: 1753: 881: 765: 670: 646: 638: 634: 595: 378: 3049: 3039: 3029: 3012: 3007: 2997: 2956: 2786: 2766: 2702: 2634: 2375: 2350: 2295: 1970: 1937: 1843: 1833: 1792: 1720: 1090: 859: 733: 662: 585: 409: 397: 344: 2921: 2896: 2891: 2841: 2603: 2125: 2059: 2052: 2004: 1803: 1758: 1700: 1669:
Gemmological classifications by E. Ya. Kievlenko (1980), updated
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Ordinary chrysoberyl is yellowish-green and transparent to
1354:"Bonhams : Alexandrite and Platinum and Diamond Ring" 722:(1792–1866), and named alexandrite in honor of the future 178:
Crystals tabular or short prismatic, prominently striated
1031:"Chrysoberyl: Chrysoberyl mineral information and data" 1446:(Second ed.). Brunswick House Press. p. 93. 610:, often forming their own minerals; this is called a 455:" as a gemstone); that name is no longer used in the 692:
direction through the crystal that would arise from
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Distinct on {110}, imperfect on {010}, poor on {001}
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The name chrysoberyl is derived from the 2591: 2400: 2221: 2207: 2199: 2169: 1905: 1681: 1652: 1638: 1630: 27:Mineral or gemstone of beryllium aluminate 1329: 1319: 1270: 1260: 1145: 1143: 1141: 962: 687:) of the visible light spectrum. Because 564:Learn how and when to remove this message 1602:, and does not reflect subsequent edits. 1054: 1052: 929: 778: 584:produces relatively low-density molten 494:or opalescence that reminds one of the 29: 1157:from the original on 18 December 2016 1067:from the original on 19 February 2017 641:, and tourmaline. When found in such 7: 1386:from the original on 12 October 2016 1037:from the original on 13 January 2017 993:from the original on 2 February 2017 939:"IMA–CNMNC approved mineral symbols" 542:adding citations to reliable sources 349:Main chrysoberyl producing countries 1124:(20th ed.). New York: Wiley. 987:"Mineralienatlas – Fossilienatlas" 25: 1360:from the original on 7 March 2016 1216:from the original on 14 July 2014 830:An alexandrite ring with diamonds 760:laced with trace elements (e.g., 617:Chrysoberyl can also grow in the 576:Chrysoberyl forms as a result of 154:c = 4.428 Å; Z = 4 2180: 2168: 1715: 1584: 888:Although other minerals such as 836:History of alexandrite gemstones 823: 811: 796: 784: 514: 423:. These twinned crystals have a 38: 1782:Yellow, Green, Violet Sapphires 1538:from the original on 2007-07-11 1504:from the original on 2008-05-30 1479:from the original on 2016-07-07 1412:from the original on 2007-10-12 848:Given the rarity of the true " 466:(trichroic) gem, will exhibit 402:Mohs scale of mineral hardness 44:Cyclic trilling of chrysoberyl 1: 1151:"Alexandrite Quality Factors" 791:Rough alexandrite from Brazil 2174:List of gemstones by species 2143:List of individual gemstones 1804:Precious White and Fire Opal 711:red by incandescent light. 3253: 3227:Minerals in space group 62 1321:10.1038/s41598-020-62707-3 1262:10.1038/s41598-020-62707-3 1061:"Chrysoberyl Mineral Data" 580:processes. Melting in the 331:Color change; green to red 3158: 2166: 2158:List of sapphires by size 1667: 1473:International Gem Society 1442:Wise, Richard W. (2016). 1177:Rudler, Frederick William 1087:Rudler, Frederick William 37: 2153:List of emeralds by size 1444:Secrets Of the Gem trade 803:Rough alexandrite under 720:Nils Gustaf Nordenskiöld 498:. When cut to produce a 462:Alexandrite, a strongly 2723:Nickel silver (alpacca) 1188:Encyclopædia Britannica 1102:Encyclopædia Britannica 1580: 1560:Listen to this article 1012:Handbook of Mineralogy 943:Mineralogical Magazine 872:chrysoberyl is called 868:Translucent yellowish 865: 350: 3222:Orthorhombic minerals 3064:Other natural objects 1721:Natural marine pearls 1579: 863: 770:simulated alexandrite 754:synthetic alexandrite 724:Emperor of All Russia 699:Alexandrite from the 348: 97:Strunz classification 2539:Wire wrapped jewelry 2519:Repoussé and chasing 1840:, pink, yellow-green 1611:More spoken articles 1380:"GIA – Report Check" 1120:Manual of Mineralogy 727:Alexander II Romanov 538:improve this section 208:Conchoidal to uneven 3081:Ebonite (vulcanite) 2187:Minerals portal 1759:Precious Black Opal 1620:Alexandrite display 1312:2020NatSR..10.6130X 1253:2020NatSR..10.6130X 1092:"Chrysoberyl"  964:10.1180/mgm.2021.43 955:2021MinM...85..291W 937:Warr, L.N. (2021). 3217:Beryllium minerals 3212:Aluminium minerals 2426:Jewellery designer 2009:Opaque iridescent 1900:Jewelry-Industrial 1846:yellow, blue, pink 1581: 1300:Scientific Reports 1241:Scientific Reports 1017:2011-12-15 at the 866: 850:alexandrite effect 764:) or color-change 485:incandescent light 351: 266:Optical properties 152:b = 9.415 Å, 150:a = 5.481 Å, 123:Dipyramidal (mmm) 3199: 3198: 3116: 3115: 2986:Organic gemstones 2583: 2582: 2196: 2195: 2024:Industrial stones 2019: 2018: 1895: 1894: 1577: 1182:"Cat's-Eye"  1059:Barthelmy, Dave. 905:Duke of Connaught 574: 573: 566: 481:color temperature 368:with the formula 343: 342: 16:(Redirected from 3244: 3237:Spinel gemstones 2643:Britannia silver 2592: 2401: 2223: 2216: 2209: 2200: 2185: 2184: 2183: 2172: 2171: 2148:List of diamonds 1906: 1682: 1654: 1647: 1640: 1631: 1621: 1601: 1599: 1588: 1587: 1578: 1568: 1566: 1561: 1547: 1546: 1544: 1543: 1528: 1522: 1519: 1513: 1512: 1510: 1509: 1494: 1488: 1487: 1485: 1484: 1464: 1458: 1457: 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3193: 3188: 3183: 3178: 3173: 3168: 3163: 3162:Related topics 3159: 3156: 3155: 3153: 3152: 3147: 3142: 3136: 3130: 3124: 3122: 3118: 3117: 3114: 3113: 3111: 3110: 3105: 3104: 3103: 3093: 3088: 3083: 3078: 3073: 3067: 3065: 3061: 3060: 3058: 3057: 3052: 3047: 3042: 3037: 3032: 3027: 3026: 3025: 3020: 3010: 3005: 3000: 2995: 2989: 2987: 2983: 2982: 2980: 2979: 2974: 2969: 2964: 2959: 2954: 2949: 2944: 2939: 2934: 2929: 2924: 2919: 2909: 2904: 2899: 2894: 2889: 2884: 2879: 2874: 2869: 2864: 2859: 2854: 2849: 2844: 2839: 2834: 2829: 2824: 2819: 2814: 2809: 2804: 2799: 2794: 2784: 2779: 2774: 2769: 2763: 2761: 2754: 2753: 2751: 2750: 2745: 2740: 2735: 2730: 2725: 2720: 2715: 2710: 2705: 2699: 2697: 2691: 2690: 2688: 2687: 2682: 2681: 2680: 2670: 2665: 2660: 2655: 2650: 2645: 2639: 2637: 2630: 2629: 2627: 2626: 2621: 2616: 2611: 2606: 2600: 2598: 2589: 2585: 2584: 2581: 2580: 2578: 2577: 2572: 2567: 2562: 2557: 2551: 2549: 2545: 2544: 2542: 2541: 2536: 2534:Wire sculpture 2531: 2526: 2521: 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1766: 1761: 1756: 1751: 1746: 1741: 1735: 1733: 1727: 1726: 1724: 1723: 1718: 1713: 1708: 1703: 1698: 1692: 1690: 1679: 1672: 1671: 1668: 1665: 1664: 1659: 1657: 1656: 1649: 1642: 1634: 1628: 1627: 1604: 1590: 1583: 1571: 1558: 1557: 1555: 1554:External links 1552: 1549: 1548: 1523: 1514: 1489: 1459: 1452: 1434: 1422: 1397: 1371: 1345: 1286: 1227: 1194: 1168: 1137: 1130: 1108: 1097:Chisholm, Hugh 1078: 1048: 1022: 1004: 978: 949:(3): 291–320. 928: 927: 925: 922: 921: 920: 913: 910: 857: 854: 837: 834: 833: 832: 829: 822: 820: 817: 810: 808: 802: 795: 793: 790: 783: 781: 738:Andhra Pradesh 701:Ural Mountains 683:(520–620  679: 676: 572: 571: 522: 520: 513: 507: 504: 459:nomenclature. 381: 375: 341: 340: 337: 333: 332: 329: 325: 324: 320: 319: 317: 313: 312: 309: 303: 302: 299: 293: 292: 288: 284: 280: 277: 271: 270: 267: 263: 262: 259: 253: 252: 249: 243: 242: 239: 233: 232: 229: 220: 219: 216: 210: 209: 206: 200: 199: 196: 190: 189: 186: 180: 179: 176: 170: 169: 165: 161: 160: 159:Identification 156: 155: 148: 142: 141: 136: 130: 129: 121: 115: 114: 109: 107:Crystal system 103: 102: 99: 93: 92: 89: 83: 82: 79: 75: 72: 62: 61: 59:Oxide minerals 56: 52: 51: 47: 46: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3249: 3238: 3235: 3233: 3230: 3228: 3225: 3223: 3220: 3218: 3215: 3213: 3210: 3209: 3207: 3192: 3189: 3187: 3184: 3182: 3179: 3177: 3174: 3172: 3169: 3167: 3166:Body piercing 3164: 3161: 3160: 3157: 3151: 3148: 3146: 3143: 3140: 3137: 3134: 3131: 3129: 3126: 3125: 3123: 3119: 3109: 3106: 3102: 3099: 3098: 3097: 3094: 3092: 3089: 3087: 3084: 3082: 3079: 3077: 3074: 3072: 3069: 3068: 3066: 3062: 3056: 3055:Tortoiseshell 3053: 3051: 3048: 3046: 3043: 3041: 3038: 3036: 3033: 3031: 3028: 3024: 3021: 3019: 3016: 3015: 3014: 3011: 3009: 3006: 3004: 3001: 2999: 2996: 2994: 2991: 2990: 2988: 2984: 2978: 2975: 2973: 2970: 2968: 2965: 2963: 2960: 2958: 2955: 2953: 2950: 2948: 2945: 2943: 2940: 2938: 2935: 2933: 2930: 2928: 2925: 2923: 2920: 2917: 2913: 2910: 2908: 2905: 2903: 2900: 2898: 2895: 2893: 2890: 2888: 2885: 2883: 2880: 2878: 2875: 2873: 2870: 2868: 2865: 2863: 2860: 2858: 2855: 2853: 2850: 2848: 2845: 2843: 2840: 2838: 2835: 2833: 2830: 2828: 2825: 2823: 2820: 2818: 2815: 2813: 2810: 2808: 2805: 2803: 2800: 2798: 2795: 2792: 2788: 2785: 2783: 2780: 2778: 2775: 2773: 2770: 2768: 2765: 2764: 2762: 2760: 2755: 2749: 2746: 2744: 2741: 2739: 2736: 2734: 2731: 2729: 2726: 2724: 2721: 2719: 2716: 2714: 2711: 2709: 2706: 2704: 2701: 2700: 2698: 2696: 2692: 2686: 2683: 2679: 2676: 2675: 2674: 2671: 2669: 2666: 2664: 2661: 2659: 2656: 2654: 2651: 2649: 2646: 2644: 2641: 2640: 2638: 2636: 2631: 2625: 2622: 2620: 2617: 2615: 2612: 2610: 2607: 2605: 2602: 2601: 2599: 2597: 2593: 2590: 2586: 2576: 2573: 2571: 2568: 2566: 2563: 2561: 2558: 2556: 2553: 2552: 2550: 2546: 2540: 2537: 2535: 2532: 2530: 2527: 2525: 2522: 2520: 2517: 2515: 2512: 2510: 2507: 2505: 2502: 2500: 2497: 2495: 2492: 2490: 2487: 2485: 2482: 2478: 2475: 2473: 2470: 2468: 2465: 2464: 2463: 2460: 2458: 2455: 2454: 2452: 2448: 2442: 2439: 2437: 2434: 2432: 2429: 2427: 2424: 2422: 2419: 2417: 2414: 2412: 2411:Bench jeweler 2409: 2408: 2406: 2402: 2399: 2395: 2387: 2384: 2382: 2379: 2378: 2377: 2374: 2372: 2369: 2367: 2364: 2362: 2359: 2357: 2354: 2352: 2349: 2347: 2344: 2342: 2339: 2337: 2334: 2332: 2329: 2327: 2324: 2322: 2319: 2317: 2314: 2312: 2309: 2307: 2304: 2302: 2299: 2297: 2294: 2292: 2289: 2287: 2284: 2282: 2279: 2277: 2274: 2272: 2269: 2267: 2264: 2262: 2259: 2257: 2254: 2252: 2249: 2247: 2244: 2243: 2241: 2239: 2235: 2231: 2224: 2219: 2217: 2212: 2210: 2205: 2204: 2201: 2189: 2188: 2177: 2176: 2175: 2165: 2159: 2156: 2154: 2151: 2149: 2146: 2144: 2141: 2140: 2138: 2134: 2127: 2123: 2119: 2116: 2113: 2109: 2105: 2102: 2100: 2097: 2094: 2092: 2089: 2087: 2084: 2082: 2079: 2077: 2074: 2071: 2068: 2066: 2063: 2061: 2057: 2054: 2050: 2047: 2045: 2042: 2040: 2037: 2034: 2032: 2029: 2028: 2026: 2022: 2012: 2008: 2006: 2002: 2000: 1997: 1995: 1992: 1988: 1984: 1982: 1979: 1977: 1974: 1972: 1969: 1968: 1966: 1964: 1960: 1954: 1951: 1949: 1946: 1943: 1939: 1936: 1934: 1931: 1929: 1926: 1924: 1921: 1919: 1916: 1915: 1913: 1911: 1907: 1904: 1898: 1888: 1884: 1882: 1879: 1877: 1874: 1872: 1868: 1864: 1860: 1856: 1853: 1851: 1848: 1845: 1842: 1839: 1835: 1832: 1829: 1826: 1823: 1820: 1819: 1817: 1815: 1811: 1805: 1802: 1800: 1797: 1794: 1790: 1788: 1785: 1783: 1780: 1779: 1777: 1775: 1771: 1765: 1762: 1760: 1757: 1755: 1752: 1750: 1747: 1745: 1742: 1740: 1739:Pink sapphire 1737: 1736: 1734: 1732: 1728: 1722: 1719: 1717: 1714: 1712: 1711:Blue Sapphire 1709: 1707: 1704: 1702: 1699: 1697: 1694: 1693: 1691: 1689: 1688: 1683: 1680: 1677: 1673: 1666: 1662: 1655: 1650: 1648: 1643: 1641: 1636: 1635: 1632: 1626: 1622: 1617: 1616: 1612: 1608: 1593: 1553: 1537: 1533: 1527: 1524: 1518: 1515: 1503: 1499: 1493: 1490: 1478: 1474: 1470: 1463: 1460: 1455: 1453:9780972822329 1449: 1445: 1438: 1435: 1431: 1426: 1423: 1411: 1407: 1401: 1398: 1385: 1381: 1375: 1372: 1359: 1355: 1349: 1346: 1341: 1337: 1332: 1327: 1322: 1317: 1313: 1309: 1305: 1301: 1297: 1290: 1287: 1282: 1278: 1273: 1268: 1263: 1258: 1254: 1250: 1246: 1242: 1238: 1231: 1228: 1215: 1211: 1205: 1203: 1201: 1199: 1195: 1190: 1189: 1183: 1178: 1172: 1169: 1156: 1152: 1146: 1144: 1142: 1138: 1133: 1131:0-471-80580-7 1127: 1122: 1121: 1112: 1109: 1104: 1103: 1098: 1093: 1088: 1082: 1079: 1066: 1062: 1055: 1053: 1049: 1036: 1032: 1026: 1023: 1020: 1016: 1013: 1008: 1005: 992: 988: 982: 979: 974: 970: 965: 960: 956: 952: 948: 944: 940: 933: 930: 923: 919: 916: 915: 911: 909: 906: 901: 897: 895: 891: 886: 883: 879: 875: 871: 862: 855: 853: 851: 846: 842: 835: 826: 821: 814: 809: 806: 799: 794: 787: 782: 779: 777: 775: 771: 767: 763: 759: 756:are actually 755: 750: 747: 743: 739: 735: 730: 728: 725: 721: 716: 712: 710: 706: 702: 697: 695: 690: 686: 677: 675: 672: 668: 664: 660: 654: 652: 648: 644: 640: 636: 631: 627: 624: 620: 619:country rocks 615: 613: 609: 605: 601: 597: 592: 587: 583: 582:Earth's crust 579: 568: 565: 557: 547: 543: 539: 533: 532: 528: 523:This section 521: 517: 512: 511: 505: 503: 501: 497: 493: 488: 486: 482: 477: 473: 469: 465: 460: 458: 454: 450: 446: 442: 438: 434: 429: 426: 422: 418: 413: 411: 407: 403: 399: 395: 392:and βήρυλλος 391: 388:words χρυσός 387: 380: 374: 371: 367: 363: 359: 356: 347: 338: 334: 330: 326: 321: 318: 314: 311:Measured: 70° 310: 308: 304: 300: 298: 294: 278: 276: 272: 268: 264: 260: 258: 254: 250: 248: 244: 240: 238: 234: 230: 225: 221: 217: 215: 211: 207: 205: 201: 197: 195: 191: 187: 185: 181: 177: 175: 174:Crystal habit 171: 166: 162: 157: 149: 147: 143: 140: 137: 135: 131: 127: 122: 120: 119:Crystal class 116: 113: 110: 108: 104: 100: 98: 94: 90: 88: 84: 73: 67: 63: 60: 57: 53: 48: 41: 36: 31: 19: 3191:Wearable art 3186:Phaleristics 3181:Metalworking 3086:Gutta-percha 2862:Lapis lazuli 2801: 2648:Colored gold 2529:Stonesetting 2178: 2122:Pyrophyllite 2091:Serpentinite 2072:(green mica) 1962: 1942:Baltic amber 1909: 1813: 1773: 1730: 1685: 1540:. Retrieved 1526: 1517: 1506:. Retrieved 1492: 1481:. Retrieved 1472: 1462: 1443: 1437: 1429: 1425: 1414:. Retrieved 1400: 1388:. Retrieved 1374: 1362:. Retrieved 1348: 1303: 1299: 1289: 1244: 1240: 1230: 1218:. Retrieved 1186: 1171: 1159:. Retrieved 1119: 1111: 1100: 1081: 1069:. Retrieved 1039:. Retrieved 1025: 1007: 995:. Retrieved 981: 946: 942: 932: 902: 898: 887: 877: 873: 867: 847: 843: 839: 769: 751: 731: 717: 713: 698: 689:human vision 681: 655: 616: 575: 560: 551: 536:Please help 524: 496:eye of a cat 489: 461: 440: 436: 430: 420: 417:cyclic twins 414: 393: 389: 357: 352: 138: 112:Orthorhombic 3128:Art jewelry 2952:Tiger's eye 2857:Labradorite 2807:Chrysocolla 2802:Chrysoberyl 2718:Mokume-gane 2695:Base metals 2467:centrifugal 2436:Silversmith 2311:Ferronnière 2261:Belt buckle 2256:Belly chain 2104:Ophicalcite 1985:Colorless, 1948:Chrysoprase 1859:Spessartine 1824:– Verdelite 1716:Alexandrite 1306:(1): 6130. 1247:(1): 6130. 780:Alexandrite 694:pleochroism 678:Alexandrite 476:wavelengths 457:gemological 441:alexandrite 433:translucent 358:chrysoberyl 328:Alexandrite 297:Pleochroism 269:Biaxial (+) 134:Space group 33:Chrysoberyl 18:Alexandrite 3206:Categories 2962:Tourmaline 2907:Prasiolite 2782:Aventurine 2653:Crown gold 2555:Draw plate 2504:Metal clay 2441:Watchmaker 2431:Lapidarist 2416:Clockmaker 2291:Collar pin 2286:Chatelaine 2108:Serpentine 2096:Aventurine 2070:Listwanite 1861:(malaya), 1828:Indicolite 1822:Tourmaline 1795:(Imperial) 1787:Aquamarine 1607:Audio help 1598:2015-03-26 1542:2007-07-09 1508:2007-07-09 1483:2016-09-21 1416:2007-07-09 1390:20 January 1364:20 January 1161:20 January 1071:20 January 1041:20 January 997:20 January 924:References 890:tourmaline 742:Madagascar 667:ultramafic 578:pegmatitic 506:Occurrence 492:chatoyancy 464:pleochroic 404:, between 316:References 224:Mohs scale 126:H-M symbol 87:IMA symbol 3108:Toadstone 3045:Operculum 2972:Variscite 2967:Turquoise 2947:Tanzanite 2882:Moonstone 2877:Marcasite 2872:Malachite 2797:Carnelian 2772:Amazonite 2759:gemstones 2733:Pinchbeck 2678:Argentium 2668:Shibuichi 2609:Palladium 2588:Materials 2524:Soldering 2514:Polishing 2489:Engraving 2484:Enameling 2450:Processes 2421:Goldsmith 2356:Tie chain 2331:Neck ring 2321:Lapel pin 2230:Jewellery 2099:quartzite 2051:(Porouse 2049:Cacholong 2011:feldspars 1981:Rhodonite 1976:Amazonite 1963:2nd order 1933:Malachite 1910:1st order 1887:Turquoise 1867:Almandine 1863:Rhodolite 1814:4th order 1774:3rd order 1764:Tanzanite 1749:Tsavorite 1744:Demantoid 1731:2nd order 1687:1st order 1661:Gemstones 973:235729616 894:scapolite 878:cat's eye 874:cymophane 870:chatoyant 856:Cymophane 746:synthetic 709:raspberry 705:columbine 651:Sri Lanka 630:dolomitic 612:pegmatite 525:does not 445:Victorian 437:cymophane 425:hexagonal 421:trillings 366:beryllium 362:aluminate 339:Chatoyant 336:Cymophane 146:Unit cell 3176:Gemology 3150:Fineness 3141:(purity) 3076:Bog-wood 3023:Precious 3003:Ammolite 2942:Sunstone 2932:Sodalite 2927:Sapphire 2887:Obsidian 2827:Fluorite 2817:Diopside 2777:Amethyst 2757:Mineral 2748:Tungsten 2743:Titanium 2658:Electrum 2614:Platinum 2499:Kazaziye 2494:Filigree 2472:lost-wax 2371:Toe ring 2361:Tie clip 2336:Pectoral 2326:Necklace 2301:Cufflink 2276:Bracelet 2271:Bolo tie 2251:Barrette 2118:Pagodite 2086:Fluorite 2081:Selenite 2065:Obsidian 1999:Hematite 1953:Charoite 1928:Nephrite 1918:Lazurite 1876:Amethyst 1838:Heliodor 1609: · 1536:Archived 1534:. 1887. 1502:Archived 1500:. 2006. 1477:Archived 1410:Archived 1408:. 2006. 1384:Archived 1358:Archived 1340:32273534 1281:32273534 1214:Archived 1179:(1911). 1155:Archived 1089:(1911). 1065:Archived 1035:Archived 1015:Archived 991:Archived 912:See also 805:UV light 774:sapphire 762:vanadium 758:corundum 659:chromium 600:feldspar 554:May 2024 500:cabochon 408:(9) and 406:corundum 394:beryllos 355:gemstone 307:2V angle 287:=1.748 n 283:=1.745 n 261:3.5–3.84 241:Vitreous 227:hardness 214:Tenacity 204:Fracture 194:Cleavage 184:Twinning 55:Category 3171:Fashion 3145:Finding 2993:Abalone 2902:Peridot 2867:Larimar 2852:Kyanite 2837:Howlite 2822:Emerald 2812:Diamond 2685:Tumbaga 2663:Shakudō 2619:Rhodium 2570:Mandrel 2509:Plating 2462:Casting 2457:Carving 2366:Tie pin 2341:Pendant 2316:Genital 2306:Earring 2136:Related 2112:Calcite 2058:Marble 2039:granite 2036:Graphic 2003:Common 1923:Jadeite 1881:Citrine 1855:Garnets 1850:Peridot 1799:Elbaite 1791:Orange 1706:Emerald 1696:Diamond 1676:Jewelry 1625:YouTube 1596: ( 1567:minutes 1331:7145866 1308:Bibcode 1272:7145866 1249:Bibcode 1099:(ed.). 951:Bibcode 908:Lanka. 643:placers 626:schists 608:niobium 604:lithium 546:removed 531:sources 468:emerald 453:peridot 449:olivine 419:called 390:chrysos 218:Brittle 101:4.BA.05 66:Formula 50:General 3135:(mass) 3071:Bezoar 2977:Zircon 2937:Spinel 2912:Quartz 2847:Jasper 2832:Garnet 2728:Pewter 2713:Copper 2708:Bronze 2635:alloys 2624:Silver 2575:Pliers 2565:Hammer 2477:vacuum 2404:People 2397:Making 2381:pocket 2281:Brooch 2246:Anklet 2031:Jasper 1994:quartz 1902:stones 1871:Pyrope 1754:Spinel 1678:stones 1450:  1338:  1328:  1279:  1269:  1220:6 June 1128:  971:  882:rutile 766:spinel 671:felsic 647:Brazil 639:garnet 635:spinel 596:quartz 439:, and 360:is an 291:=1.754 247:Streak 237:Luster 3139:Carat 3133:Carat 3121:Terms 3096:Shell 3050:Pearl 3040:Nacre 3030:Ivory 3018:Black 3013:Coral 3008:Copal 2998:Amber 2957:Topaz 2916:smoky 2787:Beryl 2767:Agate 2703:Brass 2548:Tools 2386:strap 2376:Watch 2351:Tiara 2296:Crown 2266:Bindi 2238:Forms 1987:smoky 1971:Agate 1938:Amber 1885:Blue 1844:Topaz 1834:Beryl 1793:topaz 1095:. In 969:S2CID 734:India 663:mafic 606:, or 586:magma 412:(8). 410:topaz 398:beryl 386:Greek 251:White 168:light 164:Color 3091:Hair 2922:Ruby 2897:Opal 2892:Onyx 2842:Jade 2604:Gold 2560:File 2346:Ring 2126:Talc 2060:onyx 2053:opal 2005:opal 1991:pink 1989:and 1701:Ruby 1448:ISBN 1392:2017 1366:2017 1336:PMID 1277:PMID 1222:2014 1163:2017 1126:ISBN 1073:2017 1043:2017 999:2017 665:and 649:and 623:mica 598:and 529:any 527:cite 139:Pbnm 91:Cbrl 74:BeAl 3035:Jet 2791:red 2076:Jet 1623:on 1326:PMC 1316:doi 1267:PMC 1257:doi 959:doi 876:or 740:), 707:or 540:by 364:of 231:8.5 3208:: 1869:, 1865:, 1857:– 1836:– 1565:12 1475:. 1471:. 1382:. 1356:. 1334:. 1324:. 1314:. 1304:10 1302:. 1298:. 1275:. 1265:. 1255:. 1245:10 1243:. 1239:. 1212:. 1197:^ 1185:. 1153:. 1140:^ 1063:. 1051:^ 1033:. 989:. 967:. 957:. 947:85 945:. 941:. 892:, 696:. 685:nm 637:, 451:(" 373:Al 370:Be 2918:) 2914:( 2793:) 2789:( 2222:e 2215:t 2208:v 2128:) 2124:/ 2120:( 2114:) 2110:/ 2106:( 2055:) 1944:) 1940:( 1653:e 1646:t 1639:v 1613:) 1605:( 1600:) 1569:) 1562:( 1545:. 1511:. 1486:. 1456:. 1419:. 1394:. 1368:. 1342:. 1318:: 1310:: 1283:. 1259:: 1251:: 1224:. 1165:. 1134:. 1075:. 1045:. 1001:. 975:. 961:: 953:: 736:( 567:) 561:( 556:) 552:( 548:. 534:. 382:4 379:O 376:2 289:γ 285:β 281:α 279:n 80:4 78:O 76:2 20:)

Index

Alexandrite

Oxide minerals
Formula
IMA symbol
Strunz classification
Crystal system
Orthorhombic
Crystal class
H-M symbol
Space group
Unit cell
Crystal habit
Twinning
Cleavage
Fracture
Tenacity
Mohs scale
Luster
Streak
Specific gravity
Refractive index
Pleochroism
2V angle

gemstone
aluminate
beryllium
Be
Al

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