Quartz
      Glinnemann J, King H E, Schulz H, Hahn T, La Placa S J, Dacol F
      Zeitschrift fur Kristallographie 198 (1992) 177-212
      Crystal structures of the low-temperature quartz-type phases of SiO2 and GeO2 at elevated pressure
      P = 7.2 GPa
      _database_code_amcsd 0011009

      CELL PARAMETERS:    4.6764   4.6764   5.2475   90.000   90.000  120.000
      SPACE GROUP: P3_121    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     99.382
      Density (g/cm3):      3.011
      MAX. ABS. INTENSITY / VOLUME**2:      32.73479605    
      RIR:      3.540
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.95         20.55        4.0499    1   0   0         6
                27.83         80.89        3.2061    1   0   1         6
                27.83         19.11        3.2061    0   1   1         6
                38.50         13.91        2.3382    1   1   0         3
                40.99          4.73        2.2020    1   0   2         6
                40.99         11.06        2.2020    0   1   2         6
                42.32          5.85        2.1358    1   1   1         6
                44.76          8.75        2.0249    2   0   0         6
                48.17          1.03        1.8892    2   0   1         6
                52.30          1.69        1.7492    0   0   3         2
                52.42          8.02        1.7456    1   1   2         6
                57.38          2.17        1.6058    1   0   3         6
                57.49          4.42        1.6030    0   2   2         6
                57.49          3.49        1.6030    2   0   2         6
                63.29          6.02        1.4695    1   2   1         6
                63.29          5.32        1.4695    2   1   1         6
                66.79          2.94        1.4006    1   1   3         6
                71.24          5.18        1.3237    0   2   3         6
                71.33          7.75        1.3222    2   1   2         6
                72.27          7.62        1.3074    3   0   1         6
                76.30          3.52        1.2480    0   1   4         6
                76.30          1.54        1.2480    1   0   4         6
                79.92          3.47        1.2004    0   3   2         6
                84.02          3.71        1.1519    1   2   3         6
                84.73          1.91        1.1441    1   1   4         6
                86.68          1.44        1.1232    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.