Quartz
      Levien L, Prewitt C T, Weidner D J
      American Mineralogist 65 (1980) 920-930
      Structure and elastic properties of quartz at pressure
      P = 48.6 kbar
      _database_code_amcsd 0000792

      CELL PARAMETERS:    4.7390   4.7390   5.2790   90.000   90.000  120.000
      SPACE GROUP: P3_221    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    102.673
      Density (g/cm3):      2.915
      MAX. ABS. INTENSITY / VOLUME**2:      33.33766604    
      RIR:      3.724
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.65         21.01        4.1041    1   0   0         6
                27.53         21.67        3.2401    1   0   1         6
                27.53         78.33        3.2401    0   1   1         6
                37.97         11.74        2.3695    1   1   0         3
                40.64          9.62        2.2200    1   0   2         6
                40.64          3.53        2.2200    0   1   2         6
                41.79          5.41        2.1617    1   1   1         6
                44.13          7.90        2.0520    2   0   0         6
                47.54          1.05        1.9126    2   0   1         6
                51.85          8.82        1.7632    1   1   2         6
                51.97          1.20        1.7597    0   0   3         2
                56.83          3.44        1.6201    0   2   2         6
                56.83          3.19        1.6201    2   0   2         6
                56.94          2.09        1.6173    0   1   3         6
                62.40          5.44        1.4883    2   1   1         6
                62.40          5.27        1.4883    1   2   1         6
                66.15          2.61        1.4127    1   1   3         6
                70.40          6.62        1.3374    1   2   2         6
                70.50          5.12        1.3358    2   0   3         6
                71.20          6.82        1.3243    0   3   1         6
                75.70          1.19        1.2564    0   1   4         6
                75.70          3.01        1.2564    1   0   4         6
                78.80          3.00        1.2146    3   0   2         6
                82.98          3.37        1.1636    2   1   3         6
                83.92          1.99        1.1530    1   1   4         6
                85.26          1.30        1.1383    3   1   0         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.