Triphylite, GRR 176a, Center Straford, New Hampshire, R.T. 0.072 mm, E ||c = 4.65 A = alpha 345.4, .1719 350.6, .16 354.1, .156 358.4, .154 360.4, .153 363.1, .153 365.7, .15 369., .145 372.3, .142 374.6, .137 377.2, .132 380.4, .13 383.7, .128 386.2, .128 388.5, .128 390.7, .129 392.6, .129 394.8, .128 397.9, .128 400.1, .129 401., .131 402.5, .132 404.7, .133 405.9, .138 406.4, .144 406.7, .15 407.1, .155 407.2, .16 407.4, .162 407.8, .158 408., .152 408.4, .145 408.7, .142 409.3, .137 410.1, .136 410.9, .132 412.5, .126 414.1, .121 416.7, .118 420.3, .116 423.9, .116 426.8, .116 429.2, .116 433.3, .118 437.1, .119 440.2, .121 443.7, .123 446.5, .123 450.1, .124 452.2, .123 456.1, .12 458.9, .118 460.7, .117 463.3, .115 464.4, .115 466.4, .117 467.8, .118 469., .12 469.9, .12 471.6, .12 473.2, .114 476.2, .108 479.7, .105 483.1, .104 485.9, .104 488.3, .104 492.6, .104 495.7, .104 497.8, .104 499.9, .104 507.5, .101 517., .099 525.1, .099 535.8, .099 542.7, .102 547.5, .103 563.2, .103 573.6, .104 582.3, .105 589.7, .108 599.2, .111 607.1, .112 616.5, .108 622.9, .104 633.5, .1 640.9, .1 654.4, .099 663.6, .1 674., .103 687.9, .105 701.3, .107 718.9, .108 736.8, .109 752.9, .109 775.9, .11 788.6, .112 806.7, .12 824.2, .13 840.2, .142 854.5, .16 866.6, .183 881.2, .214 892.9, .25 901.9, .283 911., .32 920.6, .367 929., .405 936.2, .449 942.9, .49 950.9, .538 958.4, .592 965., .638 971., .689 976.7, .733 986., .81 994.1, .868 998.6, .906 1003.9, .953 1006.1, .976 1011.4, 1.016 1017.3, 1.054 1025.3, 1.11 1033.9, 1.165 1042.2, 1.213 1050.7, 1.255 1057., 1.275 1063.1, 1.293 1069.6, 1.305 1075.1, 1.312 1079.9, 1.314 1084.4, 1.311 1088.5, 1.306 1094.4, 1.295 1099.6, 1.28 1106.4, 1.258 1112.5, 1.231 1117.6, 1.201 1124., 1.163 1127.6, 1.137 1131.6, 1.107 1135.4, 1.08 1139.9, 1.051 1142.8, 1.031 1145.1, 1.014 1148.1, 1.001 1151.1, .977 1155.7, .95 1160.6, .916 1166., .878 1171.1, .845 1178., .81 1186.6, .766 1195.2, .727 1204.9, .688 1215.5, .659 1223., .634 1233.1, .615 1241.5, .602 1280.7, .57 1311.4, .561 1329.4, .558 1346.5, .553 1357.4, .548 1369.9, .54 1384.1, .53 1397.3, .52 1410.3, .508 1423.6, .494 1435.5, .481 1450.8, .464 1464.4, .447 1481.5, .424 1492.6, .409 1510.2, .384 1523.2, .367 1537.7, .349 1554.4, .328 1571.6, .305 1590.3, .284 1606., .269 1622.4, .253 1639.8, .238 1659.8, .218 1677., .2 1694.4, .186 1720.4, .169 1746.6, .157 1777.3, .146 1806.2, .138 1836.2, .131 1875.9, .121 1914.3, .116 1951.7, .114 1984.1, .112 2018.6, .111 2049.1, .11 2064.9, .109 2182.2, .105 2260.8, .103 2324.8, .101