Na.33K.67MgF3
      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 = .67
      _database_code_amcsd 0008547

      CELL PARAMETERS:    3.9622   3.9622   3.9622   90.000   90.000   90.000
      SPACE GROUP: Pm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     62.203
      Density (g/cm3):      3.072
      MAX. ABS. INTENSITY / VOLUME**2:      18.78307704    
      RIR:      1.991
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.44          7.15        3.9622    1   0   0         6
                31.94         74.81        2.8017    1   1   0        12
                39.39         71.11        2.2876    1   1   1         8
                45.80        100.00        1.9811    2   0   0         6
                51.58          2.83        1.7719    2   1   0        24
                56.93         23.71        1.6176    2   1   1        24
                66.78         44.94        1.4008    2   2   0        12
                75.94          8.38        1.2530    3   1   0        24
                80.38          9.94        1.1946    3   1   1        24
                84.75         11.76        1.1438    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.