Siderite
Lavina B, Dera P, Downs R T, Yang W, Sinogeikin S, Meng Y, Shen G, Schiferl D
Physical Review B82 (2010)  064110-8
Structure of siderite FeCO3 to 56 GPa and hysteresis of its spin-pairing transition
Locality: Invigtut, Greenland
Note: run P22, P = 49.2 GPa
_database_code_amcsd 0017584
4.364 4.364 12.66 90 90 120 R-3c
atom     x y   z  Uiso
Fe       0 0   0 .0055
C        0 0 .25  .005
O    .2883 0 .25  .007