Cryptohalite
      Bozorth R
      Journal of the American Chemical Society 44 (1922) 1066-1070
      The Crystal Structure of Ammonium Fluosilicate
      _cod_database_code 1010992
      _database_code_amcsd 0017907

      CELL PARAMETERS:    8.3800   8.3800   8.3800   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    588.480
      Density (g/cm3):      1.920
      MAX. ABS. INTENSITY / VOLUME**2:      18.44673410    
      RIR:      3.129
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.34        100.00        4.8382    1   1   1         8
                21.20         27.65        4.1900    2   0   0         6
                30.16          8.86        2.9628    2   2   0        12
                35.53          5.58        2.5267    3   1   1        24
                37.17         33.57        2.4191    2   2   2         8
                43.18         35.77        2.0950    4   0   0         6
                47.28          1.23        1.9225    3   3   1        24
                48.59          3.04        1.8738    4   2   0        24
                57.11         17.94        1.6127    5   1   1        24
                57.11          1.96        1.6127    3   3   3         8
                62.72         12.13        1.4814    4   4   0        12
                65.95          7.00        1.4165    5   3   1        48
                67.00          2.19        1.3967    6   0   0         6
                71.16          4.51        1.3250    6   2   0        24
                75.21          1.40        1.2633    6   2   2        24
                79.19          2.30        1.2095    4   4   4         8
                82.14          7.14        1.1734    5   5   1        24
                83.12          2.26        1.1621    6   4   0        24
                87.01          2.53        1.1198    6   4   2        48
                89.92          2.59        1.0910    5   5   3        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.