Anorthoclase Harlow G E American Mineralogist 67 (1982) 975-996 The anorthoclase structures: The effects of temperature and composition Kakanui, Or = 13.8, T = 750 deg C feldspar Locality: Kakanui, New Zealand _database_code_amcsd 0000879 8.321 12.969 7.148 90 116.05 90 C2/m atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Al1 .0089 .1796 .2240 .25 0.0144 0.0054 0.0163 -.0011 0.0088 -.0002 Si1 .0089 .1796 .2240 .75 0.0144 0.0054 0.0163 -.0011 0.0088 -.0002 Al2 .6972 .1170 .3437 .25 0.0121 0.0045 0.0202 -.0003 0.0081 -.0001 Si2 .6972 .1170 .3437 .75 0.0121 0.0045 0.0202 -.0003 0.0081 -.0001 Na .2839 0 .1496 .85 0.0126 0.0247 0.0619 0 0.0070 0 K .2839 0 .1496 .15 0.0126 0.0247 0.0619 0 0.0070 0 O1 0 .1378 0 0.0327 0.0083 0.0263 0 0.0151 0 O2 .6115 0 .2858 0.0145 0.0055 0.0508 0 0.0014 0 O3 .8282 .1382 .2288 0.0211 0.0123 0.0407 -.0031 0.0202 0.0018 O4 .0320 .3030 .2563 0.0251 0.0064 0.0397 -.0030 0.0150 -.0006 O5 .1850 .1251 .4121 0.0266 0.0084 0.0267 0.0023 0.0106 0.0019