Helvine
      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 0000973

      CELL PARAMETERS:    8.2360   8.2360   8.2360   90.000   90.000   90.000
      SPACE GROUP: P-43n     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    558.662
      Density (g/cm3):      3.299
      MAX. ABS. INTENSITY / VOLUME**2:      45.69359300    
      RIR:      4.509
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.58          2.03        4.1180    2   0   0         6
                24.16          8.47        3.6833    2   1   0        24
                26.51        100.00        3.3623    2   1   1        12
                30.70          2.58        2.9119    2   2   0        12
                34.44         14.32        2.6045    3   1   0        24
                37.84          4.28        2.3775    2   2   2         4
                39.45          2.11        2.2843    3   2   0        24
                41.00         19.56        2.2012    3   2   1        24
                43.98          2.53        2.0590    4   0   0         6
                46.80         23.52        1.9412    4   1   1        12
                46.80         19.80        1.9412    3   3   0        12
                49.49          5.86        1.8416    4   2   0        24
                50.80          1.94        1.7972    4   2   1        24
                52.09          1.13        1.7559    3   3   2        12
                54.59          8.49        1.6812    4   2   2        12
                57.02          2.54        1.6152    5   1   0        24
                60.54          1.13        1.5294    4   3   2        24
                61.69          5.83        1.5037    5   2   1        24
                63.94          8.50        1.4559    4   4   0        12
                66.16          4.41        1.4125    5   3   0        24
                66.16          2.91        1.4125    4   3   3        12
                68.34          5.26        1.3727    4   4   2        12
                68.34          3.34        1.3727    6   0   0         6
                70.48          6.11        1.3361    5   3   2        24
                72.60          1.40        1.3022    6   2   0        24
                74.69          8.31        1.2708    5   4   1        24
                76.76          1.02        1.2416    6   2   2        12
                82.89          1.10        1.1647    5   4   3        24
                86.92          2.90        1.1208    7   2   1        24
                86.92          4.59        1.1208    6   3   3        12
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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.