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: r57721, T = 600 C, P = 17.3 kbar, cell volume = 242.28 ang**3
      _database_code_amcsd 0003228

      CELL PARAMETERS:    6.2341   6.2341   6.2341   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    242.282
      Density (g/cm3):      2.044
      MAX. ABS. INTENSITY / VOLUME**2:      36.34464923    
      RIR:      5.791
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.64        100.00        3.1170    2   0   0         6
                40.95         63.16        2.2041    2   2   0        12
                50.73         19.33        1.7996    2   2   2         8
                59.29          8.00        1.5585    4   0   0         6
                67.15         19.91        1.3940    4   2   0        24
                74.58         13.58        1.2725    4   2   2        24
                88.78          3.95        1.1020    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.