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: r57765, T = 200 C, P = 5.5 kbar, cell volume = 245.23 ang**3
      _database_code_amcsd 0003210

      CELL PARAMETERS:    6.2593   6.2593   6.2593   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    245.232
      Density (g/cm3):      2.019
      MAX. ABS. INTENSITY / VOLUME**2:      35.91138691    
      RIR:      5.792
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.52        100.00        3.1297    2   0   0         6
                40.77         63.32        2.2130    2   2   0        12
                50.51         19.41        1.8069    2   2   2         8
                59.03          8.04        1.5648    4   0   0         6
                66.84         20.01        1.3996    4   2   0        24
                74.22         13.64        1.2777    4   2   2        24
                88.33          3.95        1.1065    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.