COL ICSD Collection Code 23922 DATE Recorded Jan 1, 1980; updated Apr 22, 1996 NAME Calcium tecto-dialumodisilicate MINR Anorthite - from Monte Somma, Vesuvius MINR Feldspar FORM Ca (Al2 Si2 O8) = Al2 Ca O8 Si2 TITL The Structure of Anorthite, Ca Al2 Si2 O8. Structure Analysis REF Acta Crystallographica (1,1948-23,1967) ACCRA 15 (1962) 1005-1017 REF Acta Crystallographica (1,1948-23,1967) ACCRA 15 (1962) 1017-1035 AUT Kempster C J E, MegawÿHÿD, RadoslovichÿEÿW CELL a=8.177 b=12.877 c=14.169 à=93.2 á=115.8 ç=91.2 V=1338.8 Z=8 SGR P -1 (2) - triclinic CLAS -1 (Hermann-Mauguin) - Ci (Schoenflies) PRS aP104 ANX AB2C2X8 PARM Atom__No OxStat Wyck ---X--- ---Y--- ---Z--- -SOF- Ca 1 2.000 2i 0.2647 0.9844 0.0873 Ca 2 2.000 2i 0.2684 0.0312 0.5438 Ca 3 2.000 2i 0.7732 0.5334 0.5422 Ca 4 2.000 2i 0.7636 0.5067 0.074 Si 1 4.000 2i 0.0099 0.1584 0.1043 Al 1 3.000 2i 0.0069 0.1609 0.6125 Si 2 4.000 2i 0.5061 0.6567 0.6033 Al 2 3.000 2i 0.4987 0.6675 0.1125 Al 3 3.000 2i 0.9928 0.8146 0.119 Si 3 4.000 2i 0.0059 0.8154 0.6129 Al 4 3.000 2i 0.5078 0.3154 0.6212 Si 4 4.000 2i 0.5034 0.3207 0.1091 Al 5 3.000 2i 0.6841 0.1134 0.1512 Si 5 4.000 2i 0.6818 0.1029 0.6644 Al 6 3.000 2i 0.1906 0.6123 0.6681 Si 6 4.000 2i 0.1714 0.6062 0.1504 Si 7 4.000 2i 0.6749 0.8828 0.1881 Al 7 3.000 2i 0.6799 0.8717 0.6715 Si 8 4.000 2i 0.1759 0.3802 0.6744 Al 8 3.000 2i 0.1865 0.379 0.1815 O 1 -2.000 2i 0.0276 0.1234 0.9957 O 2 -2.000 2i 0.9814 0.1237 0.4808 O 3 -2.000 2i 0.4873 0.6256 0.4865 O 4 -2.000 2i 0.5129 0.6256 0.997 O 5 -2.000 2i 0.5724 0.9909 0.1451 O 6 -2.000 2i 0.5732 0.9901 0.6398 O 7 -2.000 2i 0.0732 0.4876 0.633 O 8 -2.000 2i 0.0755 0.4925 0.1363 O 9 -2.000 2i 0.8114 0.1027 0.0792 O 10 -2.000 2i 0.8071 0.0996 0.6046 O 11 -2.000 2i 0.3363 0.5938 0.6045 O 12 -2.000 2i 0.2912 0.6036 0.0819 O 13 -2.000 2i 0.8148 0.8516 0.1454 O 14 -2.000 2i 0.809 0.851 0.6018 O 15 -2.000 2i 0.2983 0.3575 0.6113 O 16 -2.000 2i 0.3382 0.3606 0.1309 O 17 -2.000 2i 0.012 0.278 0.1351 O 18 -2.000 2i 0.0177 0.29 0.6486 O 19 -2.000 2i 0.5082 0.7778 0.6311 O 20 -2.000 2i 0.5102 0.7969 0.15 O 21 -2.000 2i 0.0004 0.6802 0.1063 O 22 -2.000 2i 0.0083 0.6898 0.6017 O 23 -2.000 2i 0.515 0.1794 0.609 O 24 -2.000 2i 0.5067 0.1947 0.0974 O 25 -2.000 2i 0.1795 0.1072 0.1919 O 26 -2.000 2i 0.2153 0.1057 0.6862 O 27 -2.000 2i 0.6992 0.6031 0.6779 O 28 -2.000 2i 0.6921 0.6014 0.2 O 29 -2.000 2i 0.2027 0.8723 0.2106 O 30 -2.000 2i 0.1754 0.8557 0.717 O 31 -2.000 2i 0.6861 0.3637 0.7335 O 32 -2.000 2i 0.6999 0.3691 0.1993 WYCK i52 ITF Ca 1 B=1. ITF Ca 2 B=1. ITF Ca 3 B=1. ITF Ca 4 B=1. ITF Si 1 B=0.2 ITF Al 1 B=0.2 ITF Si 2 B=0.2 ITF Al 2 B=0.2 ITF Al 3 B=0.2 ITF Si 3 B=0.2 ITF Al 4 B=0.2 ITF Si 4 B=0.2 ITF Al 5 B=0.2 ITF Si 5 B=0.2 ITF Al 6 B=0.2 ITF Si 6 B=0.2 ITF Si 7 B=0.2 ITF Al 7 B=0.2 ITF Si 8 B=0.2 ITF Al 8 B=0.2 ITF O 1 B=0.6 ITF O 2 B=0.6 ITF O 3 B=0.6 ITF O 4 B=0.6 ITF O 5 B=0.6 ITF O 6 B=0.6 ITF O 7 B=0.6 ITF O 8 B=0.6 ITF O 9 B=0.6 ITF O 10 B=0.6 ITF O 11 B=0.6 ITF O 12 B=0.6 ITF O 13 B=0.6 ITF O 14 B=0.6 ITF O 15 B=0.6 ITF O 16 B=0.6 ITF O 17 B=0.6 ITF O 18 B=0.6 ITF O 19 B=0.6 ITF O 20 B=0.6 ITF O 21 B=0.6 ITF O 22 B=0.6 ITF O 23 B=0.6 ITF O 24 B=0.6 ITF O 25 B=0.6 ITF O 26 B=0.6 ITF O 27 B=0.6 ITF O 28 B=0.6 ITF O 29 B=0.6 ITF O 30 B=0.6 ITF O 31 B=0.6 ITF O 32 B=0.6 REM M PDF 41-1486 REM M av.T-O: 1.613, 1.758, 1.615, 1.746. 1.752, 1.609, 1.741, 1.626, 1.747, 1.612, 1.756, 1.610, 1.603, 1.744, 1.629, 1.752 RVAL 0.102