Calcium-beta
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 450 C
      Hexagonal closest packed, hcp, structure
      _database_code_amcsd 0011166

      CELL PARAMETERS:    3.9800   3.9800   6.5200   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     89.443
      Density (g/cm3):      1.488
      MAX. ABS. INTENSITY / VOLUME**2:      27.96210188    
      RIR:      6.119
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                25.85         23.74        3.4468    1   0   0         6
                27.36         27.03        3.2600    0   0   2         2
                29.31        100.00        3.0472    1   0   1        12
                37.99         15.15        2.3684    1   0   2        12
                45.59         16.39        1.9900    1   1   0         6
                49.59         18.16        1.8384    1   0   3        12
                53.14          2.34        1.7234    2   0   0         6
                53.98         17.61        1.6985    1   1   2        12
                55.12         12.20        1.6662    2   0   1        12
                56.45          2.47        1.6300    0   0   4         2
                60.79          2.78        1.5236    2   0   2        12
                63.09          2.40        1.4735    1   0   4        12
                69.63          4.90        1.3504    2   0   3        12
                72.56          1.39        1.3028    2   1   0        12
                74.24          7.67        1.2775    2   1   1        24
                75.38          4.83        1.2610    1   1   4        12
                78.41          3.14        1.2196    1   0   5        12
                79.18          2.02        1.2097    2   1   2        24
                84.29          1.64        1.1489    3   0   0         6
                87.25          4.42        1.1174    2   1   3        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.