Na.4K.6MgF3
      Chakhmouradian A R, Ross K, Mitchell R H, Swainson I
      Physics and Chemistry of Minerals 28 (2001) 277-284
      The crystal chemistry of synthetic potassium-bearing neighborite, (Na1-xKx)MgF3
      Sample x = .60
      _database_code_amcsd 0008546

      CELL PARAMETERS:    3.9545   3.9545   3.9545   90.000   90.000   90.000
      SPACE GROUP: Pm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     61.841
      Density (g/cm3):      3.059
      MAX. ABS. INTENSITY / VOLUME**2:      18.53421298    
      RIR:      1.973
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.48          8.96        3.9545    1   0   0         6
                32.01         72.11        2.7963    1   1   0        12
                39.47         70.07        2.2831    1   1   1         8
                45.90        100.00        1.9772    2   0   0         6
                51.69          3.37        1.7685    2   1   0        24
                57.05         23.02        1.6144    2   1   1        24
                66.93         44.86        1.3981    2   2   0        12
                71.58          1.06        1.3182    2   2   1        24
                76.12          8.13        1.2505    3   1   0        24
                80.57          9.70        1.1923    3   1   1        24
                84.96         11.72        1.1416    2   2   2         8
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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.