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 = 8.1 GPa
      _database_code_amcsd 0008418

      CELL PARAMETERS:    3.4575   3.4575   4.4510   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     46.080
      Density (g/cm3):      2.597
      MAX. ABS. INTENSITY / VOLUME**2:      29.17804397    
      RIR:      3.658
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                19.95         48.50        4.4510    0   0   1         2
                29.84         21.50        2.9943    1   0   0         6
                36.15         94.97        2.4844    0   1   1         6
                36.15          5.03        2.4844    1   0   1         6
                51.14         21.82        1.7862    1   0   2         6
                51.14         15.43        1.7862    0   1   2         6
                52.97         25.32        1.7287    1   1   0         6
                57.16         12.34        1.6115    1   1   1        12
                61.99          2.55        1.4971    2   0   0         6
                62.61          2.31        1.4837    0   0   3         2
                65.81          1.16        1.4190    0   2   1         6
                65.81          9.72        1.4190    2   0   1         6
                68.76          1.41        1.3652    1   1   2        12
                70.89          6.00        1.3294    1   0   3         6
                76.72          4.38        1.2422    0   2   2         6
                76.72          3.27        1.2422    2   0   2         6
                86.43          4.37        1.1259    1   1   3        12
                87.71          1.12        1.1128    0   0   4         2
                89.31          2.10        1.0968    1   2   1        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.