Quartz
      Levien L, Prewitt C T, Weidner D J
      American Mineralogist 65 (1980) 920-930
      Structure and elastic properties of quartz at pressure
      P = 20.7 kbar
      _database_code_amcsd 0000790

      CELL PARAMETERS:    4.8362   4.8362   5.3439   90.000   90.000  120.000
      SPACE GROUP: P3_221    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    108.242
      Density (g/cm3):      2.765
      MAX. ABS. INTENSITY / VOLUME**2:      34.44854273    
      RIR:      4.057
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.21         20.77        4.1883    1   0   0         6
                27.05         74.15        3.2965    0   1   1         6
                27.05         25.85        3.2965    1   0   1         6
                37.18          9.09        2.4181    1   1   0         3
                40.03          2.05        2.2526    0   1   2         6
                40.03          7.86        2.2526    1   0   2         6
                40.97          4.44        2.2031    1   1   1         6
                43.20          6.56        2.0941    2   0   0         6
                46.58          1.73        1.9498    2   0   1         6
                50.93         10.75        1.7929    1   1   2         6
                55.77          3.33        1.6482    0   2   2         6
                55.77          1.73        1.6482    2   0   2         6
                56.11          1.94        1.6392    0   1   3         6
                61.05          5.31        1.5178    1   2   1         6
                61.05          4.80        1.5178    2   1   1         6
                65.03          2.19        1.4342    1   1   3         6
                68.95          5.41        1.3619    1   2   2         6
                68.95          1.07        1.3619    2   1   2         6
                69.25          1.13        1.3568    0   2   3         6
                69.25          5.39        1.3568    2   0   3         6
                69.60          5.64        1.3508    0   3   1         6
                74.56          2.44        1.2728    1   0   4         6
                77.08          2.50        1.2374    3   0   2         6
                81.31          2.93        1.1833    2   1   3         6
                82.49          2.27        1.1694    1   1   4         6
                83.16          1.15        1.1616    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.