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: r57709, T = 300 C, P = 16.2 kbar, cell volume = 236.43 ang**3
      _database_code_amcsd 0003216

      CELL PARAMETERS:    6.1835   6.1835   6.1835   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    236.430
      Density (g/cm3):      2.094
      MAX. ABS. INTENSITY / VOLUME**2:      37.23309445    
      RIR:      5.789
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.88        100.00        3.0917    2   0   0         6
                41.30         62.84        2.1862    2   2   0        12
                51.17         19.18        1.7850    2   2   2         8
                59.83          7.92        1.5459    4   0   0         6
                67.77         19.72        1.3827    4   2   0        24
                75.29         13.46        1.2622    4   2   2        24
                89.70          3.94        1.0931    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.