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 P27-3, P = 55.0 GPa
      _database_code_amcsd 0017591

      CELL PARAMETERS:    4.3480   4.3480  12.5200   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    204.981
      Density (g/cm3):      5.630
      MAX. ABS. INTENSITY / VOLUME**2:      55.28076878    
      RIR:      3.197
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.65         56.97        3.2267    0   1   2         6
                37.36        100.00        2.4070    1   0   4         6
                41.54         26.52        2.1740    1   1   0         6
                47.14         21.22        1.9281    1   1   3        12
                50.63         23.02        1.8030    2   0   2         6
                57.09         13.11        1.6134    0   2   4         6
                61.61         29.13        1.5054    1   1   6        12
                64.48         14.49        1.4452    0   1   8         6
                66.07          1.35        1.4141    2   1   1        12
                67.49         13.90        1.3878    1   2   2        12
                73.03         12.54        1.2956    2   1   4        12
                75.79         13.79        1.2552    3   0   0         6
                79.67          4.10        1.2035    2   0   8         6
                80.92          2.19        1.1881    1   0  10         6
                82.28          2.01        1.1718    1   1   9        12
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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.