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 P2, P = 3.48 GPa
_database_code_amcsd 0017563
4.664 4.664 15.168 90 90 120 R-3c
atom    x y   z Uiso
Fe      0 0   0 .008
C       0 0 .25 .005
O    .273 0 .25 .009