Knowledge (XXG)

Great icosahedron

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Net (surface geometry); twelve isosceles pentagrammic pyramids, arranged like the faces of a dodecahedron. Each pyramid folds up like a fan: the dotted lines fold the opposite direction from the solid lines.
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is a degenerate polyhedron, with 20 triangular faces from the truncated vertices, and 12 (hidden) doubled up pentagonal faces ({10/2}) as truncations of the original pentagram faces, the latter forming two
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A truncation operation, repeatedly applied to the great icosahedron, produces a sequence of uniform polyhedra. Truncating edges down to points produces the
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This polyhedron represents a spherical tiling with a density of 7. (One spherical triangle face is shown above, outlined in blue, filled in yellow)
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as a rectified great icosahedron. The process completes as a birectification, reducing the original faces down to points, and producing the
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The great icosahedron can be constructed analogously to the pentagram, its two-dimensional analogue, via the extension of the
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The stellation process on the icosahedron creates a number of related
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can be seen as its four-dimensional analogue using the same process.
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for the pentagram) until the figure regains regular faces. The
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inscribed within and sharing the edges of the icosahedron.
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of the icosahedron, counted by Wenninger as model and the
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It has a density of 7, as shown in this cross-section.
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A transparent model of the great icosahedron (See also
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Animated truncation sequence from {5/2, 3} to {3, 5/2}
728: 587: 718: 650: 576: 417: 1946: 1514:; Du Val, P.; Flather, H. T.; Petrie, J. F. (1999). 1168: 542: 460: 18: 1884: 1816: 1756: 1696: 1658: 766: 703: 635: 445: 627: 600: 1636: 8: 568:For a great icosahedron with edge length E, 446:{\displaystyle {\frac {7+3{\sqrt {5}}}{2}}} 1643: 1629: 1621: 411:The edge length of a great icosahedron is 758: 740: 727: 719: 717: 695: 681: 662: 651: 649: 626: 625: 616: 605: 599: 598: 586: 585: 577: 575: 518:16th of 17 stellations of the icosahedron 430: 418: 416: 1600:"Fifteen stellations of the icosahedron" 992: 789:, with different colored faces and only 453:times that of the original icosahedron. 1463: 16:Kepler-Poinsot polyhedron with 20 faces 1743:nonconvex great rhombicosidodecahedron 1550:, (3rd edition, 1973), Dover edition, 1538:(1st Edn University of Toronto (1938)) 1185:Truncated great stellated dodecahedron 1473:"uniform polyhedra Great icosahedron" 7: 841:. This construction can be called a 14: 1861:great stellapentakis dodecahedron 1846:medial pentagonal hexecontahedron 1831:small stellapentakis dodecahedron 1748:great truncated icosidodecahedron 2158: 2151: 2144: 2137: 2130: 2123: 2116: 2109: 2102: 2093: 2086: 2079: 2072: 2065: 2058: 2051: 2044: 2037: 1876:great pentagonal hexecontahedron 1851:medial disdyakis triacontahedron 1836:medial deltoidal hexecontahedron 1447: 1440: 1433: 1426: 1419: 1406: 1401: 1396: 1391: 1386: 1381: 1376: 1367: 1362: 1357: 1352: 1347: 1342: 1337: 1328: 1323: 1318: 1313: 1308: 1303: 1298: 1289: 1284: 1279: 1274: 1269: 1264: 1259: 1250: 1245: 1240: 1235: 1230: 1225: 1220: 1100: 1095: 1090: 1085: 1080: 1075: 1070: 1061: 1056: 1051: 1046: 1041: 1036: 1031: 1026: 1021: 1011: 1004: 980: 975: 970: 965: 960: 955: 950: 945: 940: 932: 927: 922: 917: 912: 907: 902: 890: 885: 880: 875: 870: 835: 830: 825: 820: 815: 810: 805: 800: 795: 785:can be constructed as a uniform 551: 528: 506: 497: 484: 366: 361: 356: 351: 346: 341: 336: 264: 249: 174: 169: 164: 159: 154: 149: 144: 27: 1871:great disdyakis triacontahedron 1866:great deltoidal hexecontahedron 1512:Coxeter, Harold Scott MacDonald 857:, as a partial faceting of the 290:3D model of a great icosahedron 1953:stellations of the icosahedron 1826:medial rhombic triacontahedron 1560:Stellating the Platonic solids 688: 669: 1: 1856:great rhombic triacontahedron 520:and 7th of 59 stellations by 1793:great dodecahemidodecahedron 1783:small dodecahemidodecahedron 1723:truncated dodecadodecahedron 1713:truncated great dodecahedron 1683:great stellated dodecahedron 1673:small stellated dodecahedron 1210: 1159:great stellated dodecahedron 1149:great stellated dodecahedron 1138:small stellated dodecahedron 271:Great stellated dodecahedron 2011:Compound of five tetrahedra 1996:Medial triambic icosahedron 1798:great icosihemidodecahedron 1788:small icosihemidodecahedron 1738:truncated great icosahedron 1616:Uniform polyhedra and duals 2226: 2166: 2016:Compound of ten tetrahedra 2006:Compound of five octahedra 2001:Great triambic icosahedron 1991:Small triambic icosahedron 1949: 1921:great dodecahemidodecacron 1911:small dodecahemidodecacron 1808:small dodecahemicosahedron 1803:great dodecahemicosahedron 1494:Cambridge University Press 1132:. It also shares the same 847:retrosnub tetratetrahedron 482: 2115: 2050: 1979: 1969: 1964: 1926:great icosihemidodecacron 1916:small icosihemidodecacron 1518:(3rd ed.). Tarquin. 1516:The fifty-nine icosahedra 40:Kepler–Poinsot polyhedron 35: 26: 21: 2195:Kepler–Poinsot polyhedra 1936:small dodecahemicosacron 1931:great dodecahemicosacron 1718:rhombidodecadodecahedron 1652:Star-polyhedra navigator 304:Kepler–Poinsot polyhedra 1733:great icosidodecahedron 1728:snub dodecadodecahedron 1145:great icosidodecahedron 2026:Excavated dodecahedron 1887:uniform polyhedra with 1841:small rhombidodecacron 1128:as the regular convex 1121: 768: 705: 637: 447: 332:Coxeter-Dynkin diagram 291: 2205:Polyhedral stellation 1119: 898:pyritohedral symmetry 843:retrosnub tetrahedron 769: 706: 638: 448: 289: 2177:icosahedral symmetry 1986:(Convex) icosahedron 1889:infinite stellations 1697:Uniform truncations 988:retrosnub octahedron 859:truncated octahedron 791:tetrahedral symmetry 716: 648: 574: 415: 1817:Duals of nonconvex 1768:tetrahemihexahedron 1471:Klitzing, Richard. 1124:It shares the same 547: 1966:Uniform duals 1885:Duals of nonconvex 1778:octahemioctahedron 1773:cubohemioctahedron 1757:Nonconvex uniform 1708:dodecadodecahedron 1699:of Kepler-Poinsot 1678:great dodecahedron 1666:regular polyhedra) 1597:Weisstein, Eric W. 1582:Uniform polyhedron 1574:Weisstein, Eric W. 1126:vertex arrangement 1122: 986:, and is called a 764: 752: 701: 633: 596: 543: 473:Stellation diagram 464:Transparent model 443: 391:faces of the core 292: 110:Face configuration 22:Great icosahedron 2200:Regular polyhedra 2183: 2182: 2021:Great icosahedron 1971:Regular compounds 1944: 1943: 1896:tetrahemihexacron 1819:uniform polyhedra 1688:great icosahedron 1578:Great icosahedron 1562:, pp. 96–104 1547:Regular Polytopes 1525:978-1-899618-32-3 1490:Polyhedron Models 1486:Wenninger, Magnus 1455: 1454: 1192:icosidodecahedron 1164:great dodecahedra 1112:Related polyhedra 1109: 1108: 849:, similar to the 783:great icosahedron 751: 745: 722: 686: 667: 654: 623: 621: 595: 580: 561: 560: 541: 540: 441: 435: 311:regular polyhedra 300:great icosahedron 282: 281: 2217: 2162: 2155: 2148: 2141: 2134: 2127: 2120: 2113: 2106: 2097: 2090: 2083: 2076: 2069: 2062: 2055: 2048: 2041: 2031:Final stellation 1947: 1906:octahemioctacron 1901:hexahemioctacron 1645: 1638: 1631: 1622: 1610: 1609: 1591: 1537: 1507: 1477: 1476: 1468: 1451: 1444: 1437: 1430: 1423: 1411: 1410: 1409: 1405: 1404: 1400: 1399: 1395: 1394: 1390: 1389: 1385: 1384: 1380: 1379: 1372: 1371: 1370: 1366: 1365: 1361: 1360: 1356: 1355: 1351: 1350: 1346: 1345: 1341: 1340: 1333: 1332: 1331: 1327: 1326: 1322: 1321: 1317: 1316: 1312: 1311: 1307: 1306: 1302: 1301: 1294: 1293: 1292: 1288: 1287: 1283: 1282: 1278: 1277: 1273: 1272: 1268: 1267: 1263: 1262: 1255: 1254: 1253: 1249: 1248: 1244: 1243: 1239: 1238: 1234: 1233: 1229: 1228: 1224: 1223: 1169: 1134:edge arrangement 1105: 1104: 1103: 1099: 1098: 1094: 1093: 1089: 1088: 1084: 1083: 1079: 1078: 1074: 1073: 1066: 1065: 1064: 1060: 1059: 1055: 1054: 1050: 1049: 1045: 1044: 1040: 1039: 1035: 1034: 1030: 1029: 1025: 1024: 1015: 1008: 993: 985: 984: 983: 979: 978: 974: 973: 969: 968: 964: 963: 959: 958: 954: 953: 949: 948: 944: 943: 937: 936: 935: 931: 930: 926: 925: 921: 920: 916: 915: 911: 910: 906: 905: 895: 894: 893: 889: 888: 884: 883: 879: 878: 874: 873: 853:symmetry of the 851:snub tetrahedron 840: 839: 838: 834: 833: 829: 828: 824: 823: 819: 818: 814: 813: 809: 808: 804: 803: 799: 798: 773: 771: 770: 765: 763: 762: 753: 747: 746: 741: 729: 723: 720: 710: 708: 707: 702: 700: 699: 687: 682: 668: 663: 655: 652: 642: 640: 639: 634: 632: 631: 630: 624: 622: 617: 606: 604: 603: 597: 588: 581: 578: 555: 548: 545:Spherical tiling 534: 532: 510: 501: 488: 461: 452: 450: 449: 444: 442: 437: 436: 431: 419: 394: 386: 371: 370: 369: 365: 364: 360: 359: 355: 354: 350: 349: 345: 344: 340: 339: 329: 327: 326: 322: 288: 268: 253: 179: 178: 177: 173: 172: 168: 167: 163: 162: 158: 157: 153: 152: 148: 147: 132: 131: 127: 103: 102: 98: 31: 19: 2225: 2224: 2220: 2219: 2218: 2216: 2215: 2214: 2185: 2184: 1945: 1940: 1888: 1886: 1880: 1818: 1812: 1758: 1752: 1700: 1698: 1692: 1665: 1661: 1660:Kepler-Poinsot 1654: 1649: 1595: 1594: 1572: 1569: 1526: 1510: 1504: 1484: 1481: 1480: 1470: 1469: 1465: 1460: 1407: 1402: 1397: 1392: 1387: 1382: 1377: 1375: 1368: 1363: 1358: 1353: 1348: 1343: 1338: 1336: 1329: 1324: 1319: 1314: 1309: 1304: 1299: 1297: 1290: 1285: 1280: 1275: 1270: 1265: 1260: 1258: 1251: 1246: 1241: 1236: 1231: 1226: 1221: 1219: 1214: 1206: 1200: 1198: 1191: 1179: 1177: 1114: 1101: 1096: 1091: 1086: 1081: 1076: 1071: 1069: 1062: 1057: 1052: 1047: 1042: 1037: 1032: 1027: 1022: 1020: 981: 976: 971: 966: 961: 956: 951: 946: 941: 939: 933: 928: 923: 918: 913: 908: 903: 901: 891: 886: 881: 876: 871: 869: 836: 831: 826: 821: 816: 811: 806: 801: 796: 794: 779: 754: 730: 714: 713: 691: 646: 645: 572: 571: 566: 556: 535: 527: 511: 502: 489: 459: 420: 413: 412: 409: 392: 380: 367: 362: 357: 352: 347: 342: 337: 335: 324: 320: 319: 317: 315:Schläfli symbol 302:is one of four 284: 276:dual polyhedron 273: 269: 256: 254: 228: 221: 214: 198: 193: 175: 170: 165: 160: 155: 150: 145: 143: 139:Coxeter diagram 129: 125: 124: 100: 96: 95: 90:Schläfli symbol 72: 17: 12: 11: 5: 2223: 2221: 2213: 2212: 2207: 2202: 2197: 2187: 2186: 2181: 2180: 2164: 2163: 2156: 2149: 2142: 2135: 2128: 2121: 2114: 2107: 2099: 2098: 2091: 2084: 2077: 2070: 2063: 2056: 2049: 2042: 2034: 2033: 2028: 2023: 2018: 2013: 2008: 2003: 1998: 1993: 1988: 1982: 1981: 1978: 1973: 1968: 1963: 1957: 1956: 1942: 1941: 1939: 1938: 1933: 1928: 1923: 1918: 1913: 1908: 1903: 1898: 1892: 1890: 1882: 1881: 1879: 1878: 1873: 1868: 1863: 1858: 1853: 1848: 1843: 1838: 1833: 1828: 1822: 1820: 1814: 1813: 1811: 1810: 1805: 1800: 1795: 1790: 1785: 1780: 1775: 1770: 1764: 1762: 1754: 1753: 1751: 1750: 1745: 1740: 1735: 1730: 1725: 1720: 1715: 1710: 1704: 1702: 1694: 1693: 1691: 1690: 1685: 1680: 1675: 1669: 1667: 1656: 1655: 1650: 1648: 1647: 1640: 1633: 1625: 1619: 1618: 1613: 1612: 1611: 1568: 1567:External links 1565: 1564: 1563: 1542:H.S.M. Coxeter 1539: 1524: 1508: 1502: 1479: 1478: 1462: 1461: 1459: 1456: 1453: 1452: 1445: 1438: 1431: 1424: 1417: 1413: 1412: 1373: 1334: 1295: 1256: 1217: 1213:Coxeter-Dynkin 1209: 1208: 1203: 1194: 1187: 1182: 1173: 1113: 1110: 1107: 1106: 1067: 1017: 1016: 1009: 1001: 1000: 997: 778: 775: 761: 757: 750: 744: 739: 736: 733: 726: 698: 694: 690: 685: 680: 677: 674: 671: 666: 661: 658: 629: 620: 615: 612: 609: 602: 594: 591: 584: 565: 562: 559: 558: 539: 538: 525: 504: 495: 481: 480: 475: 470: 465: 458: 455: 440: 434: 429: 426: 423: 408: 405: 401:grand 600-cell 280: 279: 262: 246: 245: 234: 230: 229: 226: 219: 212: 207: 201: 200: 196: 191: 187: 185:Symmetry group 181: 180: 141: 135: 134: 122: 120:Wythoff symbol 116: 115: 112: 106: 105: 92: 86: 85: 82: 81:Faces by sides 78: 77: 62: 56: 55: 50: 43: 42: 37: 33: 32: 24: 23: 15: 13: 10: 9: 6: 4: 3: 2: 2222: 2211: 2208: 2206: 2203: 2201: 2198: 2196: 2193: 2192: 2190: 2178: 2174: 2170: 2165: 2161: 2157: 2154: 2150: 2147: 2143: 2140: 2136: 2133: 2129: 2126: 2122: 2119: 2112: 2108: 2105: 2101: 2100: 2096: 2092: 2089: 2085: 2082: 2078: 2075: 2071: 2068: 2064: 2061: 2057: 2054: 2047: 2043: 2040: 2036: 2035: 2032: 2029: 2027: 2024: 2022: 2019: 2017: 2014: 2012: 2009: 2007: 2004: 2002: 1999: 1997: 1994: 1992: 1989: 1987: 1984: 1983: 1977: 1974: 1972: 1967: 1962: 1959: 1958: 1955: 1954: 1948: 1937: 1934: 1932: 1929: 1927: 1924: 1922: 1919: 1917: 1914: 1912: 1909: 1907: 1904: 1902: 1899: 1897: 1894: 1893: 1891: 1883: 1877: 1874: 1872: 1869: 1867: 1864: 1862: 1859: 1857: 1854: 1852: 1849: 1847: 1844: 1842: 1839: 1837: 1834: 1832: 1829: 1827: 1824: 1823: 1821: 1815: 1809: 1806: 1804: 1801: 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1774: 1771: 1769: 1766: 1765: 1763: 1761: 1760:hemipolyhedra 1755: 1749: 1746: 1744: 1741: 1739: 1736: 1734: 1731: 1729: 1726: 1724: 1721: 1719: 1716: 1714: 1711: 1709: 1706: 1705: 1703: 1695: 1689: 1686: 1684: 1681: 1679: 1676: 1674: 1671: 1670: 1668: 1663: 1657: 1653: 1646: 1641: 1639: 1634: 1632: 1627: 1626: 1623: 1617: 1614: 1607: 1606: 1601: 1598: 1593: 1592: 1589: 1588: 1583: 1579: 1575: 1571: 1570: 1566: 1561: 1557: 1556:0-486-61480-8 1553: 1549: 1548: 1543: 1540: 1535: 1531: 1527: 1521: 1517: 1513: 1509: 1505: 1503:0-521-09859-9 1499: 1495: 1491: 1487: 1483: 1482: 1474: 1467: 1464: 1457: 1450: 1446: 1443: 1439: 1436: 1432: 1429: 1425: 1422: 1418: 1415: 1414: 1374: 1335: 1296: 1257: 1218: 1216: 1211: 1204: 1202: 1195: 1193: 1188: 1186: 1183: 1181: 1174: 1171: 1170: 1167: 1165: 1160: 1157: 1152: 1150: 1146: 1141: 1139: 1135: 1131: 1127: 1118: 1111: 1068: 1019: 1018: 1014: 1010: 1007: 1003: 1002: 999:Pyritohedral 998: 995: 994: 991: 989: 899: 867: 865: 864:omnitruncated 860: 856: 852: 848: 844: 792: 788: 784: 776: 774: 759: 755: 748: 742: 737: 734: 731: 724: 711: 696: 692: 683: 678: 675: 672: 664: 659: 656: 643: 618: 613: 610: 607: 592: 589: 582: 569: 563: 554: 550: 549: 546: 531: 526: 523: 519: 515: 509: 505: 500: 496: 493: 487: 483: 479: 476: 474: 471: 469: 466: 463: 462: 456: 454: 438: 432: 427: 424: 421: 406: 404: 402: 398: 397:line segments 390: 387:-dimensional 384: 377: 375: 333: 316: 312: 309: 305: 301: 297: 287: 277: 272: 267: 263: 260: 259:Vertex figure 252: 248: 247: 244: 241: 238: 235: 232: 231: 225: 218: 211: 208: 206: 203: 202: 194: 188: 186: 183: 182: 142: 140: 137: 136: 123: 121: 118: 117: 113: 111: 108: 107: 93: 91: 88: 87: 83: 80: 79: 76:= 12 (χ = 2) 75: 70: 66: 63: 61: 58: 57: 54: 51: 48: 45: 44: 41: 38: 34: 30: 25: 20: 2020: 1976:Regular star 1950: 1687: 1603: 1585: 1559: 1545: 1515: 1489: 1466: 1207:icosahedron 1180:dodecahedron 1158: 1153: 1142: 1123: 996:Tetrahedral 987: 862: 846: 842: 782: 780: 712: 653:Surface Area 644: 579:Circumradius 570: 567: 410: 407:Construction 382: 378: 374:pentagrammic 299: 293: 73: 68: 64: 1664:(nonconvex 1201:icosahedron 1130:icosahedron 866:tetrahedron 855:icosahedron 243:deltahedron 199:, , (*532) 133:| 2 3 53:icosahedron 2210:Deltahedra 2189:Categories 1558:, 3.6 6.2 1458:References 514:stellation 376:sequence. 233:Properties 205:References 47:Stellation 2173:compounds 2169:polyhedra 1701:polyhedra 1662:polyhedra 1605:MathWorld 1587:MathWorld 1197:Truncated 1178:stellated 1156:truncated 777:As a snub 492:Animation 308:nonconvex 240:nonconvex 1951:Notable 1488:(1974). 1416:Picture 564:Formulas 512:It is a 313:), with 296:geometry 60:Elements 1980:Others 1961:Regular 1534:0676126 1215:diagram 1136:as the 522:Coxeter 468:Density 389:simplex 323:⁄ 237:Regular 128:⁄ 114:V(5)/2 99:⁄ 1584:") at 1554:  1532:  1522:  1500:  721:Volume 457:Images 298:, the 84:20{3} 67:= 20, 2175:with 1205:Great 1199:great 1190:Great 1176:Great 1172:Name 255:(3)/2 2171:and 1580:" (" 1552:ISBN 1520:ISBN 1498:ISBN 1154:The 900:as, 861:(or 787:snub 781:The 533:Ă— 12 330:and 71:= 30 49:core 36:Type 1576:, " 938:or 868:): 845:or 478:Net 385:–1) 334:of 318:{3, 294:In 195:, H 94:{3, 2191:: 2179:. 1602:. 1544:, 1530:MR 1528:. 1496:. 1492:. 1151:. 1140:. 990:. 793:: 732:25 614:22 608:50 524:. 494:) 328:} 278:) 261:) 227:41 222:, 220:69 215:, 213:53 104:} 1644:e 1637:t 1630:v 1608:. 1590:. 1536:. 1506:. 1475:. 760:3 756:E 749:4 743:5 738:9 735:+ 725:= 697:2 693:E 689:) 684:5 679:4 676:+ 673:5 670:( 665:3 660:3 657:= 628:) 619:5 611:+ 601:( 593:4 590:E 583:= 439:2 433:5 428:3 425:+ 422:7 393:n 383:n 381:( 325:2 321:5 306:( 274:( 257:( 224:W 217:C 210:U 197:3 192:h 190:I 130:2 126:5 101:2 97:5 74:V 69:E 65:F

Index


Kepler–Poinsot polyhedron
Stellation
icosahedron
Elements
Schläfli symbol
Face configuration
Wythoff symbol
Coxeter diagram
Symmetry group
Ih
References
U
C
W
Regular
nonconvex
deltahedron

Vertex figure

Great stellated dodecahedron
dual polyhedron

geometry
Kepler–Poinsot polyhedra
nonconvex
regular polyhedra
Schläfli symbol
Coxeter-Dynkin diagram

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