Anorthoclase Harlow G E American Mineralogist 67 (1982) 975-996 The anorthoclase structures: The effects of temperature and composition Mt. Gibele, Or = 22.3, T = 23 deg C feldspar Locality: Mt. Gibele, Pantelleria Islands, Italy _database_code_amcsd 0000876 8.252 12.936 7.139 92.11 116.32 90.22 C-1 atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Al1 .0085 .1711 .2185 .25 0.0085 0.0019 0.0069 0.0000 0.0047 0.0005 Si1 .0085 .1711 .2185 .75 0.0085 0.0019 0.0069 0.0000 0.0047 0.0005 Al2 .0060 .8164 .2271 .25 0.0082 0.0016 0.0066 0.0011 0.0044 0.0008 Si2 .0060 .8164 .2271 .75 0.0082 0.0016 0.0066 0.0011 0.0044 0.0008 Al3 .6933 .1115 .3289 .25 0.0080 0.0013 0.0084 0.0005 0.0044 0.0005 Si3 .6933 .1115 .3289 .75 0.0080 0.0013 0.0084 0.0005 0.0044 0.0005 Al4 .6904 .8798 .3496 .25 0.0084 0.0013 0.0081 0.0007 0.0045 0.0006 Si4 .6904 .8798 .3496 .75 0.0084 0.0013 0.0081 0.0007 0.0045 0.0006 Na .2743 .0033 .1353 .75 0.0000 0.0074 0.0167 0.0007 -.0003 -.0091 K .2743 .0033 .1353 .25 0.0000 0.0074 0.0167 0.0007 -.0003 -.0091 O1 .0033 .1377 .9907 0.0150 0.0035 0.0109 0.0012 0.0076 0.0012 O2 .5994 .9945 .2802 0.0117 0.0019 0.0138 0.0005 0.0052 0.0008 O3 .8219 .1194 .2092 0.0128 0.0044 0.0177 0.0001 0.0096 0.0011 O4 .8212 .8531 .2381 0.0117 0.0044 0.0171 0.0014 0.0087 0.0004 O5 .0207 .2964 .2688 0.0115 0.0027 0.0137 0.0001 0.0063 -.0001 O6 .0227 .6899 .2312 0.0116 0.0024 0.0128 0.0009 0.0044 0.0006 O7 .1916 .1171 .3943 0.0126 0.0029 0.0105 0.0009 0.0044 0.0011 O8 .1881 .8701 .4191 0.0116 0.0029 0.0115 0.0005 0.0038 0.0001