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 P20-2, P = 47.2 GPa
      _database_code_amcsd 0017582

      CELL PARAMETERS:    4.3680   4.3680  12.7500   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    210.672
      Density (g/cm3):      5.478
      MAX. ABS. INTENSITY / VOLUME**2:      56.57043565    
      RIR:      3.362
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.42         54.65        3.2532    0   1   2         6
                36.88        100.00        2.4375    1   0   4         6
                41.34         26.06        2.1840    1   1   0         6
                46.76         21.02        1.9425    1   1   3        12
                50.32         23.54        1.8133    2   0   2         6
                56.58         13.38        1.6266    0   2   4         6
                60.82         31.17        1.5230    1   1   6        12
                63.32         15.73        1.4687    0   1   8         6
                65.72          1.45        1.4209    2   1   1        12
                67.09         15.01        1.3951    1   2   2        12
                72.45         13.27        1.3045    2   1   4        12
                75.38         14.48        1.2609    3   0   0         6
                78.48          4.51        1.2188    2   0   8         6
                79.30          2.58        1.2082    1   0  10         6
                80.88          2.21        1.1885    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.