Cryptohalite
      Schlemper E O, Hamilton W C, Rush J J
      Journal of Chemical Physics 44 (1966) 2499-2505
      Structure of cubic ammonium fluosilicate: Neutron-diffraction and
      neutron-inelastic-scattering studies
      Locality: synthetic
      _database_code_amcsd 0012983

      CELL PARAMETERS:    8.3950   8.3950   8.3950   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    591.646
      Density (g/cm3):      2.000
      MAX. ABS. INTENSITY / VOLUME**2:      19.22270792    
      RIR:      3.130
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.30        100.00        4.8469    1   1   1         8
                21.17         17.26        4.1975    2   0   0         6
                30.11         11.78        2.9681    2   2   0        12
                35.46          5.17        2.5312    3   1   1        24
                37.10         27.74        2.4234    2   2   2         8
                43.10         27.80        2.0988    4   0   0         6
                47.19          1.44        1.9259    3   3   1        24
                48.50          2.27        1.8772    4   2   0        24
                57.00         13.98        1.6156    5   1   1        24
                57.00          1.63        1.6156    3   3   3         8
                62.59          7.50        1.4840    4   4   0        12
                65.81          4.93        1.4190    5   3   1        48
                66.87          1.81        1.3992    6   0   0         6
                71.01          3.31        1.3274    6   2   0        24
                79.02          1.14        1.2117    4   4   4         8
                81.96          4.38        1.1755    5   5   1        24
                82.94          1.55        1.1642    6   4   0        24
                86.82          1.50        1.1218    6   4   2        48
                89.72          1.44        1.0929    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.