Sylvite
      Wyckoff R W G
      Crystal Structures 1 (1963) 85-237
      Second edition. Interscience Publishers, New York, New York
      rocksalt structure
      _database_code_amcsd 0011329

      CELL PARAMETERS:    6.2929   6.2929   6.2929   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    249.207
      Density (g/cm3):      1.987
      MAX. ABS. INTENSITY / VOLUME**2:      35.34236198    
      RIR:      5.792
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.36        100.00        3.1465    2   0   0         6
                40.55         63.52        2.2249    2   2   0        12
                50.22         19.52        1.8166    2   2   2         8
                58.68          8.09        1.5732    4   0   0         6
                66.44         20.15        1.4071    4   2   0        24
                73.76         13.72        1.2845    4   2   2        24
                87.74          3.96        1.1124    4   4   0        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.