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 = 9.7 GPa
      _database_code_amcsd 0008419

      CELL PARAMETERS:    3.4420   3.4420   4.4053   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     45.199
      Density (g/cm3):      2.648
      MAX. ABS. INTENSITY / VOLUME**2:      30.41465571    
      RIR:      3.740
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.16         44.42        4.4053    0   0   1         2
                29.98         22.10        2.9809    1   0   0         6
                36.39         94.02        2.4688    0   1   1         6
                36.39          5.98        2.4688    1   0   1         6
                51.59         22.37        1.7715    1   0   2         6
                51.59         14.19        1.7715    0   1   2         6
                53.22         24.88        1.7210    1   1   0         6
                57.49         12.30        1.6030    1   1   1        12
                62.30          2.85        1.4904    2   0   0         6
                63.34          2.55        1.4684    0   0   3         2
                66.19          1.48        1.4118    0   2   1         6
                66.19          9.73        1.4118    2   0   1         6
                69.29          1.92        1.3561    1   1   2        12
                71.64          5.56        1.3173    1   0   3         6
                77.30          4.60        1.2344    0   2   2         6
                77.30          3.20        1.2344    2   0   2         6
                87.28          5.00        1.1171    1   1   3        12
                88.85          1.07        1.1013    0   0   4         2
                89.87          2.17        1.0915    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.