Calcite
      Effenberger H, Mereiter K, Zemann J
      Zeitschrift fur Kristallographie 156 (1981) 233-243
      Crystal structure refinements of magnesite, calcite, rhodochrosite, siderite,
      smithsonite, and dolomite, with discussion of some aspects of the
      stereochemistry of calcite type carbonates
      Locality: Iceland
      _database_code_amcsd 0020835

      CELL PARAMETERS:    4.9896   4.9896  17.0610   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    367.846
      Density (g/cm3):      2.706
      MAX. ABS. INTENSITY / VOLUME**2:      26.79829927    
      RIR:      3.224
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                23.07          8.20        3.8548    0   1   2         6
                29.42        100.00        3.0355    1   0   4         6
                31.46          2.14        2.8435    0   0   6         2
                36.00         14.31        2.4948    1   1   0         6
                39.44         19.14        2.2846    1   1   3        12
                43.19         14.78        2.0944    2   0   2         6
                47.15          6.55        1.9274    0   2   4         6
                47.55         20.02        1.9124    0   1   8         6
                48.55         20.79        1.8753    1   1   6        12
                56.61          3.54        1.6258    2   1   1        12
                57.45         10.00        1.6041    1   2   2        12
                60.72          5.80        1.5252    2   1   4        12
                61.05          2.68        1.5178    2   0   8         6
                61.43          2.91        1.5094    1   1   9        12
                63.11          2.15        1.4732    1   2   5        12
                64.72          6.94        1.4404    3   0   0         6
                65.67          3.90        1.4218    0   0  12         2
                69.25          1.39        1.3568    2   1   7        12
                70.31          2.39        1.3390    0   2  10         6
                72.96          3.08        1.2967    1   2   8        12
                77.23          2.32        1.2352    1   1  12        12
                81.60          2.67        1.1798    2   1  10        12
                83.85          1.67        1.1538    1   3   4        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.