Portlandite
      Henderson D M, Gutowsky H S
      American Mineralogist 47 (1962) 1231-1251
      A nuclear magnetic resonance determination of the hydrogen positions in Ca(OH)2
      T = 25 C
      _database_code_amcsd 0000117

      CELL PARAMETERS:    3.5925   3.5925   4.9050   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     54.823
      Density (g/cm3):      2.244
      MAX. ABS. INTENSITY / VOLUME**2:      23.64395583    
      RIR:      3.431
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.09         64.74        4.9050    0   0   1         2
                28.69         16.80        3.1112    1   0   0         6
                34.13          2.37        2.6273    1   0   1         6
                34.13         97.63        2.6273    0   1   1         6
                47.19         17.93        1.9260    1   0   2         6
                47.19         23.99        1.9260    0   1   2         6
                50.83         27.61        1.7962    1   1   0         6
                54.39         14.50        1.6867    1   1   1        12
                56.26          1.18        1.6350    0   0   3         2
                59.42          1.89        1.5556    2   0   0         6
                62.65          9.84        1.4828    2   0   1         6
                64.37          9.42        1.4473    1   0   3         6
                64.37          1.16        1.4473    0   1   3         6
                71.87          4.56        1.3136    2   0   2         6
                71.87          3.37        1.3136    0   2   2         6
                77.91          1.40        1.2263    0   0   4         2
                79.22          2.01        1.2091    1   1   3        12
                84.78          1.99        1.1435    1   2   1        12
                85.02          1.16        1.1408    1   0   4         6
                86.32          3.06        1.1270    0   2   3         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.