Feldspar Benna P, Bruno E American Mineralogist 88 (2003) 1532-1541 Single-crystal in situ high-temperature structural investigation of the I-1 - I2/c phase transition in Ca0.2Sr0.8Al2Si2O8 feldspar T = 620 C _database_code_amcsd 0003181 8.386 12.970 14.283 90 115.46 90 I2/c atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Ca .2723 -.0019 .0661 .2 .041 .022 .055 .043 .000 .009 -.004 Sr .2723 -.0019 .0661 .8 .041 .022 .055 .043 .000 .009 -.004 SiT1(0) .0070 .1752 .1082 .020 .021 .025 .017 -.004 .010 -.001 AlT1(z) .0030 .1781 .6165 .020 .022 .023 .018 -.004 .010 -.001 AlT2(0) .6955 .1209 .1708 .020 .019 .020 .021 -.001 .008 .000 SiT2(z) .6863 .1133 .6722 .019 .018 .018 .022 -.002 .008 -.001 OA(1) .0053 .1303 .0005 .030 .039 .036 .018 -.001 .016 -.002 OA(2) .5930 .0002 .1426 .030 .023 .019 .044 .001 .010 .001 OB(0) .8290 .1273 .1062 .038 .032 .045 .045 -.012 .025 -.005 OB(z) .8098 .1276 .6125 .040 .030 .050 .051 -.007 .027 .005 OC(0) .0137 .2985 .1180 .037 .035 .028 .043 -.010 .013 -.007 OC(z) .0198 .3100 .6311 .035 .030 .026 .048 -.011 .016 -.006 OD(0) .1865 .1252 .1957 .042 .035 .055 .024 .005 .003 .005 OD(z) .1979 .1190 .7038 .039 .035 .043 .027 .003 .004 .002