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 P20-1, P = 46.92 GPa
      _database_code_amcsd 0017581

      CELL PARAMETERS:    4.3720   4.3720  12.7200   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    210.561
      Density (g/cm3):      5.481
      MAX. ABS. INTENSITY / VOLUME**2:      54.91796062    
      RIR:      3.262
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.41         56.50        3.2534    0   1   2         6
                36.91        100.00        2.4351    1   0   4         6
                41.30         26.15        2.1860    1   1   0         6
                46.75         21.29        1.9430    1   1   3        12
                50.29         23.05        1.8145    2   0   2         6
                56.58         13.35        1.6267    0   2   4         6
                60.87         30.27        1.5219    1   1   6        12
                63.45         15.16        1.4660    0   1   8         6
                65.65          1.32        1.4221    2   1   1        12
                67.03         14.23        1.3962    1   2   2        12
                72.42         12.94        1.3050    2   1   4        12
                75.30         14.13        1.2621    3   0   0         6
                78.57          4.33        1.2175    2   0   8         6
                79.49          2.40        1.2058    1   0  10         6
                81.01          2.12        1.1869    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.