Quartz
      Levien L, Prewitt C T, Weidner D J
      American Mineralogist 65 (1980) 920-930
      Structure and elastic properties of quartz at pressure
      P = 61.4 kbar
      _database_code_amcsd 0000794

      CELL PARAMETERS:    4.7020   4.7020   5.2560   90.000   90.000  120.000
      SPACE GROUP: P3_221    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    100.636
      Density (g/cm3):      2.974
      MAX. ABS. INTENSITY / VOLUME**2:      32.94220631    
      RIR:      3.607
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.83         20.90        4.0721    1   0   0         6
                27.71         79.52        3.2190    0   1   1         6
                27.71         20.48        3.2190    1   0   1         6
                38.28         13.03        2.3510    1   1   0         3
                40.87         10.29        2.2081    1   0   2         6
                40.87          4.17        2.2081    0   1   2         6
                42.10          5.67        2.1461    1   1   1         6
                44.50          8.48        2.0360    2   0   0         6
                52.20          8.30        1.7522    1   1   2         6
                52.21          1.42        1.7520    0   0   3         2
                57.24          3.45        1.6095    0   2   2         6
                57.24          3.86        1.6095    2   0   2         6
                57.24          2.11        1.6094    0   1   3         6
                62.92          5.72        1.4771    2   1   1         6
                62.92          5.28        1.4771    1   2   1         6
                66.56          2.78        1.4048    1   1   3         6
                70.97          7.20        1.3281    1   2   2         6
                70.97          5.08        1.3280    2   0   3         6
                71.83          7.22        1.3142    0   3   1         6
                76.12          1.36        1.2505    0   1   4         6
                76.12          3.25        1.2505    1   0   4         6
                79.47          3.20        1.2060    3   0   2         6
                83.63          3.53        1.1563    2   1   3         6
                84.46          1.94        1.1470    1   1   4         6
                86.09          1.35        1.1294    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.