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: msl515037, T = 600 C, P = 0.0 kbar, cell volume = 270.14 ang**3
      _database_code_amcsd 0003226

      CELL PARAMETERS:    6.4644   6.4644   6.4644   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    270.137
      Density (g/cm3):      1.833
      MAX. ABS. INTENSITY / VOLUME**2:      32.60049997    
      RIR:      5.792
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.60        100.00        3.2322    2   0   0         6
                39.43         64.57        2.2855    2   2   0        12
                48.80         20.04        1.8661    2   2   2         8
                56.98          8.36        1.6161    4   0   0         6
                64.46         20.84        1.4455    4   2   0        24
                71.50         14.16        1.3195    4   2   2        24
                84.85          4.01        1.1428    4   4   0        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.