Na.3K.7MgF3
      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 = .70
      _database_code_amcsd 0008548

      CELL PARAMETERS:    3.9659   3.9659   3.9659   90.000   90.000   90.000
      SPACE GROUP: Pm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     62.377
      Density (g/cm3):      3.076
      MAX. ABS. INTENSITY / VOLUME**2:      18.88585884    
      RIR:      1.999
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.42          6.44        3.9659    1   0   0         6
                31.91         75.97        2.8043    1   1   0        12
                39.35         71.54        2.2897    1   1   1         8
                45.76        100.00        1.9829    2   0   0         6
                51.53          2.62        1.7736    2   1   0        24
                56.87         24.01        1.6191    2   1   1        24
                66.71         44.98        1.4022    2   2   0        12
                75.86          8.49        1.2541    3   1   0        24
                80.29         10.05        1.1958    3   1   1        24
                84.66         11.78        1.1449    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.