(K.9Na.1)Cl
      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: b&w, T = 25 C, P = 0.0 kbar, cell volume = 242.35 ang**3
      _database_code_amcsd 0003230

      CELL PARAMETERS:    6.2347   6.2347   6.2347   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    242.352
      Density (g/cm3):      1.999
      MAX. ABS. INTENSITY / VOLUME**2:      34.79950887    
      RIR:      5.669
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.64        100.00        3.1174    2   0   0         6
                40.94         63.30        2.2043    2   2   0        12
                50.72         19.40        1.7998    2   2   2         8
                59.29          8.03        1.5587    4   0   0         6
                67.14         19.99        1.3941    4   2   0        24
                74.57         13.62        1.2727    4   2   2        24
                88.77          3.95        1.1021    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.