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 = 7.4 GPa Locality: synthetic _database_code_amcsd 0004411 8.116 12.410 13.728 90 114.19 90 P2_1/c atom x y z occ Uiso Ca0 .5393 .2571 .3142 .2 .015 Sr0 .5393 .2571 .3142 .8 .015 Cai .0120 .7417 .8229 .2 .015 Sri .0120 .7417 .8229 .8 .015 Si100 .2475 .4267 .3635 .012 Si10i .7281 .9395 .8447 .012 Al1z0 .2520 .4135 .8732 .014 Al1zi .7399 .9518 .3602 .010 Al200 .9410 .3890 .4291 .011 Al20i .4274 .8679 .9164 .011 Si2z0 .9393 .3521 .9351 .012 Si2zi .4207 .8726 .4235 .012 OA10 .2652 .3856 .2532 .013 OA1i .7568 .8757 .7506 .019 OA20 .8621 .2711 .4515 .025 OA2i .3275 .7406 .8725 .023 OB00 .0638 .3729 .3516 .019 OB0i .5478 .8832 .8410 .027 OBz0 .0571 .3506 .8671 .023 OBzi .5575 .8982 .3700 .027 OC00 .2373 .5578 .3785 .021 OC0i .7217 .0710 .8394 .029 OCz0 .2521 .5498 .8946 .025 OCzi .7545 .0951 .3674 .018 OD00 .4333 .3764 .4524 .025 OD0i .9077 .9128 .9466 .039 ODz0 .4647 .3613 .9510 .018 ODzi .9423 .8911 .4473 .018