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: r57741, T = 300 C, P = 11.7 kbar, cell volume = 239.30 ang**3
      _database_code_amcsd 0003215

      CELL PARAMETERS:    6.2084   6.2084   6.2084   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    239.298
      Density (g/cm3):      2.069
      MAX. ABS. INTENSITY / VOLUME**2:      36.79277900    
      RIR:      5.790
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.76        100.00        3.1042    2   0   0         6
                41.12         63.00        2.1950    2   2   0        12
                50.95         19.26        1.7922    2   2   2         8
                59.56          7.96        1.5521    4   0   0         6
                67.47         19.81        1.3882    4   2   0        24
                74.94         13.52        1.2673    4   2   2        24
                89.24          3.95        1.0975    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.