Portlandite
      Nagai T, Ito T, Hattori T, Yamanaka T
      Physics and Chemistry of Minerals 27 (2000) 462-466
      Compression mechanism and amorphization of portlandite,
      Ca(OH)2: structural refinement under pressure
      Sample: P = 4.3 GPa
      _database_code_amcsd 0008416

      CELL PARAMETERS:    3.5104   3.5104   4.6294   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     49.405
      Density (g/cm3):      2.422
      MAX. ABS. INTENSITY / VOLUME**2:      27.27358673    
      RIR:      3.666
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                19.17         60.72        4.6294    0   0   1         2
                29.38         21.16        3.0401    1   0   0         6
                35.32          3.80        2.5411    1   0   1         6
                35.32         96.20        2.5411    0   1   1         6
                49.49         21.32        1.8416    1   0   2         6
                49.49         21.80        1.8416    0   1   2         6
                52.11         28.07        1.7552    1   1   0         6
                56.03         15.66        1.6412    1   1   1        12
                59.94          1.99        1.5431    0   0   3         2
                60.95          2.71        1.5200    2   0   0         6
                64.53          1.03        1.4442    0   2   1         6
                64.53         11.06        1.4442    2   0   1         6
                66.90          1.32        1.3986    1   1   2        12
                68.15          9.08        1.3760    1   0   3         6
                74.71          4.71        1.2706    0   2   2         6
                74.71          4.81        1.2706    2   0   2         6
                83.40          4.10        1.1589    1   1   3        12
                83.53          1.64        1.1573    0   0   4         2
                87.46          2.61        1.1152    1   2   1        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.