Sylvite
      Walker D, Verma P K, Cranswick L M D, Jones R L, Clark S M, Buhre S
      American Mineralogist 89 (2004) 204-210
      Halite-sylvite thermoelasticity
      Sample: r57797, T = 100 C, P = 1.9 kbar, cell volume = 248.18 ang**3
      _database_code_amcsd 0003204

      CELL PARAMETERS:    6.2843   6.2843   6.2843   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    248.182
      Density (g/cm3):      1.995
      MAX. ABS. INTENSITY / VOLUME**2:      35.48750545    
      RIR:      5.792
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.40        100.00        3.1421    2   0   0         6
                40.60         63.47        2.2218    2   2   0        12
                50.30         19.49        1.8141    2   2   2         8
                58.77          8.08        1.5711    4   0   0         6
                66.54         20.11        1.4052    4   2   0        24
                73.88         13.70        1.2828    4   2   2        24
                87.89          3.96        1.1109    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.