Calcium
      Olijnyk H, Holzapfel W B
      Physics Letters 100A (1984) 191-194
      Phase transitions in alkaline earth metals under pressure
      Locality: synthetic
      Sample: P = 26.5 GPa
      _database_code_amcsd 0015301

      CELL PARAMETERS:    3.5590   3.5590   3.5590   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     45.080
      Density (g/cm3):      2.952
      MAX. ABS. INTENSITY / VOLUME**2:      81.44400442    
      RIR:      8.983
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                35.68        100.00        2.5166    1   1   0        12
                51.34         14.38        1.7795    2   0   0         6
                64.09         24.41        1.4530    2   1   1        24
                75.57          6.47        1.2583    2   2   0        12
                86.47          8.18        1.1255    3   1   0        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.