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 = 2.4 GPa
      _database_code_amcsd 0008415

      CELL PARAMETERS:    3.5338   3.5338   4.7120   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     50.959
      Density (g/cm3):      2.348
      MAX. ABS. INTENSITY / VOLUME**2:      25.75273775    
      RIR:      3.571
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.83         66.42        4.7120    0   0   1         2
                29.18         21.54        3.0604    1   0   0         6
                34.96          3.71        2.5665    1   0   1         6
                34.96         96.29        2.5665    0   1   1         6
                48.78         20.74        1.8669    1   0   2         6
                48.78         23.68        1.8669    0   1   2         6
                51.74         28.00        1.7669    1   1   0         6
                55.55         16.54        1.6544    1   1   1        12
                58.79          1.86        1.5707    0   0   3         2
                60.50          2.79        1.5302    2   0   0         6
                63.97         10.86        1.4554    2   0   1         6
                63.97          1.06        1.4554    0   2   1         6
                66.10          1.46        1.4135    1   1   2        12
                66.97          9.61        1.3974    1   0   3         6
                66.97          1.15        1.3974    0   1   3         6
                73.85          5.03        1.2833    2   0   2         6
                73.85          4.50        1.2833    0   2   2         6
                81.75          1.64        1.1780    0   0   4         2
                82.10          3.76        1.1739    1   1   3        12
                86.67          2.49        1.1234    1   2   1        12
                89.05          1.17        1.0994    1   0   4         6
                89.40          3.62        1.0960    0   2   3         6
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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.