Slawsonite Benna P, Nestola F, Ballaran T B, Balic-Zunic T, Lundegaard L F, Bruno E American Mineralogist 92 (2007) 1190-1199 The high-pressure structural configurations of Ca0.2Sr0.8Al2Si2O8 feldspar: The I-1-I2/c and I2/c-P2_1/c phase transitions Sample: P = 4.4 GPa Locality: synthetic _database_code_amcsd 0004409 8.209 12.780 14.009 90 115.27 90 I2/c atom x y z occ Uiso Ca .2672 -.0005 .0671 .2 .029 Sr .2672 -.0005 .0671 .8 .029 Si10 .9993 .1743 .1071 .037 Al1z .9964 .1785 .6169 .033 Al20 .6870 .1198 .1703 .035 Si2z .6794 .1125 .6721 .036 OA1 .0019 .1267 .9978 .038 OA2 .5857 .9950 .1473 .046 OB0 .8185 .1205 .1025 .042 OBz .7976 .1255 .6075 .044 OC0 .0012 .3004 .1177 .047 OCz .0051 .3135 .6311 .056 OD0 .1864 .1248 .1975 .047 ODz .1932 .1207 .7052 .048