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: r57701, T = 100 C, P = 15.0 kbar, cell volume = 233.44 ang**3
      _database_code_amcsd 0003207

      CELL PARAMETERS:    6.1573   6.1573   6.1573   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    233.438
      Density (g/cm3):      2.121
      MAX. ABS. INTENSITY / VOLUME**2:      37.70301915    
      RIR:      5.788
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.00        100.00        3.0786    2   0   0         6
                41.48         62.68        2.1769    2   2   0        12
                51.41         19.10        1.7775    2   2   2         8
                60.11          7.88        1.5393    4   0   0         6
                68.10         19.62        1.3768    4   2   0        24
                75.67         13.41        1.2569    4   2   2        24
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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.