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: r57745, T = 200 C, P = 10.2 kbar, cell volume = 240.49 ang**3
      _database_code_amcsd 0003211

      CELL PARAMETERS:    6.2187   6.2187   6.2187   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    240.491
      Density (g/cm3):      2.059
      MAX. ABS. INTENSITY / VOLUME**2:      36.61240900    
      RIR:      5.791
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.71        100.00        3.1093    2   0   0         6
                41.05         63.06        2.1986    2   2   0        12
                50.86         19.29        1.7952    2   2   2         8
                59.45          7.98        1.5547    4   0   0         6
                67.34         19.85        1.3905    4   2   0        24
                74.79         13.55        1.2694    4   2   2        24
                89.06          3.95        1.0993    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.