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 0000974

      CELL PARAMETERS:    8.2910   8.2910   8.2910   90.000   90.000   90.000
      SPACE GROUP: P-43n     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    569.929
      Density (g/cm3):      3.196
      MAX. ABS. INTENSITY / VOLUME**2:      42.56712585    
      RIR:      4.337
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.43          2.25        4.1455    2   0   0         6
                24.00          8.72        3.7078    2   1   0        24
                26.33        100.00        3.3848    2   1   1        12
                30.50          2.99        2.9313    2   2   0        12
                34.20         13.56        2.6218    3   1   0        24
                37.58          4.76        2.3934    2   2   2         4
                39.18          2.18        2.2995    3   2   0        24
                40.72         18.93        2.2159    3   2   1        24
                43.67          1.84        2.0728    4   0   0         6
                46.47         26.13        1.9542    4   1   1        12
                46.47         21.09        1.9542    3   3   0        12
                49.14          5.50        1.8539    4   2   0        24
                50.44          1.99        1.8092    4   2   1        24
                51.71          1.18        1.7676    3   3   2        12
                54.20          8.36        1.6924    4   2   2        12
                56.60          2.76        1.6260    5   1   0        24
                60.10          1.13        1.5396    4   3   2        24
                61.23          4.58        1.5137    5   2   1        24
                63.47          7.65        1.4657    4   4   0        12
                65.66          4.97        1.4219    5   3   0        24
                65.66          2.53        1.4219    4   3   3        12
                67.82          5.93        1.3818    4   4   2        12
                67.82          3.43        1.3818    6   0   0         6
                69.95          7.08        1.3450    5   3   2        24
                72.04          1.40        1.3109    6   2   0        24
                74.11          8.09        1.2793    5   4   1        24
                76.16          1.04        1.2499    6   2   2        12
                80.21          1.20        1.1967    4   4   4         4
                82.22          1.06        1.1725    5   4   3        24
                86.20          3.38        1.1283    7   2   1        24
                86.20          4.61        1.1283    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.