Calcium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Cubic closest packed, ccp, structure
      _database_code_amcsd 0011141

      CELL PARAMETERS:    5.5760   5.5760   5.5760   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    173.368
      Density (g/cm3):      1.535
      MAX. ABS. INTENSITY / VOLUME**2:      31.05073974    
      RIR:      6.585
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.71        100.00        3.2193    1   1   1         8
                32.10         48.95        2.7880    2   0   0         6
                46.04         30.35        1.9714    2   2   0        12
                54.59         32.38        1.6812    3   1   1        24
                57.23          8.99        1.6097    2   2   2         8
                67.15          3.60        1.3940    4   0   0         6
                74.12          9.86        1.2792    3   3   1        24
                76.38          8.82        1.2468    4   2   0        24
                85.27          6.06        1.1382    4   2   2        24
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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.