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 = 6.2 GPa
Locality: synthetic
_database_code_amcsd 0004410
8.128 12.671 13.866 90 114.98 90 I2/c
atom     x     y     z occ Uiso
Ca   .2654 .0009 .0685  .2 .043
Sr   .2654 .0009 .0685  .8 .043
Si10 .9955 .1773 .1070     .044
Al1z .9933 .1755 .6176     .043
Al20 .6844 .1243 .1707     .041
Si2z .6748 .1131 .6720     .044
OA1  .0027 .1293 .9981     .034
OA2  .5812 .0033 .1482     .055
OB0  .8186 .1180 .1045     .060
OBz  .7940 .1171 .6048     .054
OC0  .9884 .3034 .1141     .054
OCz  .9955 .3115 .6267     .055
OD0  .1832 .1249 .1943     .054
ODz  .1915 .1171 .7020     .056