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: r57725, T = 600 C, P = 17.3 kbar, cell volume = 241.59 ang**3
      _database_code_amcsd 0003229

      CELL PARAMETERS:    6.2282   6.2282   6.2282   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    241.595
      Density (g/cm3):      2.049
      MAX. ABS. INTENSITY / VOLUME**2:      36.44696132    
      RIR:      5.791
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.67        100.00        3.1141    2   0   0         6
                40.99         63.12        2.2020    2   2   0        12
                50.78         19.32        1.7979    2   2   2         8
                59.35          7.99        1.5570    4   0   0         6
                67.22         19.89        1.3927    4   2   0        24
                74.66         13.57        1.2713    4   2   2        24
                88.89          3.95        1.1010    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.