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 P18_HS, P = 45.13 GPa
      _database_code_amcsd 0017579

      CELL PARAMETERS:    4.4850   4.4850  13.1900   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    229.774
      Density (g/cm3):      5.023
      MAX. ABS. INTENSITY / VOLUME**2:      52.24407295    
      RIR:      3.387
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                26.63         47.68        3.3468    0   1   2         6
                35.72        100.00        2.5138    1   0   4         6
                40.21         25.04        2.2425    1   1   0         6
                45.40         19.72        1.9977    1   1   3        12
                48.89         22.30        1.8630    2   0   2         6
                54.86         11.84        1.6734    0   2   4         6
                58.82         27.93        1.5698    1   1   6        12
                61.06         15.13        1.5177    0   1   8         6
                63.79          1.75        1.4591    2   1   1        12
                65.09         13.58        1.4330    1   2   2        12
                70.17         11.13        1.3412    2   1   4        12
                73.09         12.19        1.2947    3   0   0         6
                75.67          3.75        1.2569    2   0   8         6
                76.23          1.99        1.2490    1   0  10         6
                77.86          2.00        1.2268    1   1   9        12
                89.07          2.61        1.0992    0   0  12         2
                89.36          5.09        1.0964    1   2   8        12
                89.91          2.45        1.0911    0   2  10         6
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.