Phase-D
      Yang H, Prewitt C T, Frost D J
      American Mineralogist 82 (1997) 651-654
      Crystal structure of the dense hydrous magnesium silicate, phase D
      _database_code_amcsd 0001904

      CELL PARAMETERS:    4.7453   4.7453   4.3450   90.000   90.000  120.000
      SPACE GROUP: P-31m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     84.732
      Density (g/cm3):      3.494
      MAX. ABS. INTENSITY / VOLUME**2:      16.62664741    
      RIR:      1.550
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.44         30.69        4.3450    0   0   1         2
                21.62         12.53        4.1095    1   0   0         6
                29.93        100.00        2.9857    1   0   1        12
                37.92          9.61        2.3726    1   1   0         6
                43.46         60.83        2.0824    2  -1   1         6
                43.46         13.90        2.0824    1   1   1         6
                44.07          2.92        2.0548    2   0   0         6
                49.04         19.90        1.8575    2   0   1        12
                57.52         22.94        1.6023    1   1   2         6
                57.52         42.02        1.6023    2  -1   2         6
                62.18          2.35        1.4928    2   0   2        12
                63.62         17.28        1.4626    3  -1   1        12
                63.62          2.64        1.4626    2   1   1        12
                68.50         26.52        1.3699    3   0   0         6
                68.72          5.63        1.3660    1   0   3        12
                72.33          4.34        1.3065    3   0   1        12
                77.16          9.36        1.2362    1   1   3         6
                81.27          4.76        1.1838    2   0   3        12
                84.69          1.53        1.1444    2   2   1         6
                88.73          2.28        1.1025    3   1   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.