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 = 6.3 GPa
      _database_code_amcsd 0008417

      CELL PARAMETERS:    3.4806   3.4806   4.5352   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     47.581
      Density (g/cm3):      2.515
      MAX. ABS. INTENSITY / VOLUME**2:      28.93646788    
      RIR:      3.746
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                19.57         53.09        4.5352    0   0   1         2
                29.64         20.82        3.0143    1   0   0         6
                35.77          4.19        2.5104    1   0   1         6
                35.77         95.81        2.5104    0   1   1         6
                50.36         22.13        1.8121    1   0   2         6
                50.36         18.51        1.8121    0   1   2         6
                52.59         27.26        1.7403    1   1   0         6
                56.65         13.91        1.6248    1   1   1        12
                61.32          2.24        1.5117    0   0   3         2
                61.53          2.58        1.5071    2   0   0         6
                65.23          1.04        1.4302    0   2   1         6
                65.23         10.83        1.4302    2   0   1         6
                67.89          1.23        1.3806    1   1   2        12
                69.57          7.76        1.3513    1   0   3         6
                75.79          4.83        1.2552    0   2   2         6
                75.79          4.13        1.2552    2   0   2         6
                84.98          4.54        1.1413    1   1   3        12
                85.68          1.48        1.1338    0   0   4         2
                88.48          2.54        1.1050    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.