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: r57733, T = 500 C, P = 15.0 kbar, cell volume = 241.68 ang**3
      _database_code_amcsd 0003224

      CELL PARAMETERS:    6.2289   6.2289   6.2289   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    241.676
      Density (g/cm3):      2.049
      MAX. ABS. INTENSITY / VOLUME**2:      36.43480495    
      RIR:      5.791
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.66        100.00        3.1144    2   0   0         6
                40.98         63.13        2.2022    2   2   0        12
                50.77         19.32        1.7981    2   2   2         8
                59.35          7.99        1.5572    4   0   0         6
                67.21         19.89        1.3928    4   2   0        24
                74.65         13.57        1.2715    4   2   2        24
                88.87          3.95        1.1011    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.