(K.8Na.2)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: als7k80, T = 500 C, P = 0.0 kbar, cell volume = 251.33 ang**3
      _database_code_amcsd 0003242

      CELL PARAMETERS:    6.3108   6.3108   6.3108   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    251.335
      Density (g/cm3):      1.885
      MAX. ABS. INTENSITY / VOLUME**2:      32.11267505    
      RIR:      5.548
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.28        100.00        3.1554    2   0   0         6
                40.43         63.90        2.2312    2   2   0        12
                50.07         19.71        1.8218    2   2   2         8
                58.50          8.18        1.5777    4   0   0         6
                66.23         20.37        1.4111    4   2   0        24
                73.52         13.85        1.2882    4   2   2        24
                87.42          3.97        1.1156    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.