Quartz
      Antao S M, Hassan I, Wang J, Lee P L, Toby B H
      The Canadian Mineralogist 46 (2008) 1501-1509
      State-of-the-art high-resolution powder x-ray diffraction (HRPXRD) illustrated
      with Rietveld structure refinement of quartz, sodalite, tremolite, and meionite
      Locality: not specified
      _database_code_amcsd 0006212

      CELL PARAMETERS:    4.9134   4.9134   5.4051   90.000   90.000  120.000
      SPACE GROUP: P3_221    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    113.008
      Density (g/cm3):      2.648
      MAX. ABS. INTENSITY / VOLUME**2:      35.37928570    
      RIR:      4.350
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.88         20.27        4.2552    1   0   0         6
                26.66         69.91        3.3434    0   1   1         6
                26.66         30.09        3.3434    1   0   1         6
                36.58          7.12        2.4567    1   1   0         3
                39.50          1.04        2.2813    0   1   2         6
                39.50          6.19        2.2813    1   0   2         6
                40.33          3.30        2.2365    1   1   1         6
                42.49          5.36        2.1276    2   0   0         6
                45.84          1.02        1.9797    0   2   1         6
                45.84          2.22        1.9797    2   0   1         6
                50.18         12.68        1.8179    1   1   2         6
                54.92          3.19        1.6717    0   2   2         6
                55.38          1.66        1.6591    0   1   3         6
                60.01          4.16        1.5415    2   1   1         6
                60.01          5.05        1.5415    1   2   1         6
                64.09          1.76        1.4529    1   1   3         6
                67.81          1.46        1.3821    2   1   2         6
                67.81          4.34        1.3821    1   2   2         6
                68.21          1.40        1.3749    0   2   3         6
                68.21          5.47        1.3749    2   0   3         6
                68.38          4.31        1.3719    0   3   1         6
                73.54          1.82        1.2879    1   0   4         6
                75.73          1.98        1.2559    3   0   2         6
                79.96          2.45        1.1998    2   1   3         6
                81.25          2.53        1.1840    1   1   4         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.