Genthelvite
      Hassan I, Grundy H D
      American Mineralogist 70 (1985) 186-192
      The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2
      _database_code_amcsd 0000969

      CELL PARAMETERS:    8.1090   8.1090   8.1090   90.000   90.000   90.000
      SPACE GROUP: P-43n     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    533.214
      Density (g/cm3):      3.718
      MAX. ABS. INTENSITY / VOLUME**2:      69.24331074    
      RIR:      6.065
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                15.45          1.52        5.7339    1   1   0        12
                21.92          3.97        4.0545    2   0   0         6
                24.55          5.84        3.6265    2   1   0        24
                26.93        100.00        3.3105    2   1   1        12
                31.20          2.94        2.8670    2   2   0        12
                34.99         16.87        2.5643    3   1   0        24
                38.46          3.05        2.3409    2   2   2         4
                40.09          1.47        2.2490    3   2   0        24
                41.67         19.40        2.1672    3   2   1        24
                44.70          3.66        2.0273    4   0   0         6
                47.58         21.97        1.9113    4   1   1        12
                47.58         20.02        1.9113    3   3   0        12
                50.32          6.15        1.8132    4   2   0        24
                51.66          1.35        1.7695    4   2   1        24
                52.96          1.60        1.7288    3   3   2        12
                55.52          9.73        1.6552    4   2   2        12
                57.99          2.54        1.5903    5   1   0        24
                57.99          1.38        1.5903    4   3   1        24
                62.76          9.90        1.4805    5   2   1        24
                65.07          7.96        1.4335    4   4   0        12
                67.33          4.28        1.3907    5   3   0        24
                67.33          3.36        1.3907    4   3   3        12
                69.56          5.13        1.3515    4   4   2        12
                69.56          3.73        1.3515    6   0   0         6
                71.75          5.12        1.3155    5   3   2        24
                71.75          1.02        1.3155    6   1   1        12
                73.92          1.78        1.2821    6   2   0        24
                76.07          9.28        1.2512    5   4   1        24
                84.48          1.32        1.1468    5   4   3        24
                88.63          1.07        1.1035    5   5   2        12
                88.63          5.78        1.1035    6   3   3        12
                88.63          3.12        1.1035    7   2   1        24
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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.