Quartz
      Levien L, Prewitt C T, Weidner D J
      American Mineralogist 65 (1980) 920-930
      Structure and elastic properties of quartz at pressure
      P = 37.6 kbar
      _database_code_amcsd 0000791

      CELL PARAMETERS:    4.7736   4.7736   5.3010   90.000   90.000  120.000
      SPACE GROUP: P3_221    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    104.612
      Density (g/cm3):      2.861
      MAX. ABS. INTENSITY / VOLUME**2:      33.79142050    
      RIR:      3.846
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.49         20.89        4.1341    1   0   0         6
                27.36         23.11        3.2599    1   0   1         6
                27.36         76.89        3.2599    0   1   1         6
                37.69         10.68        2.3868    1   1   0         3
                40.43          9.01        2.2313    1   0   2         6
                40.43          2.92        2.2313    0   1   2         6
                41.49          5.07        2.1764    1   1   1         6
                43.80          7.38        2.0670    2   0   0         6
                47.20          1.29        1.9258    2   0   1         6
                51.53          9.52        1.7736    1   1   2         6
                51.73          1.01        1.7670    0   0   3         2
                56.45          3.36        1.6300    0   2   2         6
                56.45          2.60        1.6300    2   0   2         6
                56.65          2.06        1.6248    0   1   3         6
                61.91          5.22        1.4988    2   1   1         6
                61.91          5.31        1.4988    1   2   1         6
                65.75          2.44        1.4202    1   1   3         6
                69.88          6.14        1.3460    1   2   2         6
                70.06          1.00        1.3431    0   2   3         6
                70.06          5.24        1.3431    2   0   3         6
                70.62          6.40        1.3337    0   3   1         6
                75.31          1.04        1.2620    0   1   4         6
                75.31          2.80        1.2620    1   0   4         6
                78.18          2.83        1.2226    3   0   2         6
                82.39          3.20        1.1705    2   1   3         6
                83.42          2.07        1.1586    1   1   4         6
                84.50          1.25        1.1466    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.