Na.22K.78MgF3
      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 = .78
      _database_code_amcsd 0008549

      CELL PARAMETERS:    3.9742   3.9742   3.9742   90.000   90.000   90.000
      SPACE GROUP: Pm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     62.770
      Density (g/cm3):      3.091
      MAX. ABS. INTENSITY / VOLUME**2:      19.17643519    
      RIR:      2.020
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.37          4.77        3.9742    1   0   0         6
                31.84         79.07        2.8102    1   1   0        12
                39.26         72.70        2.2945    1   1   1         8
                45.66        100.00        1.9871    2   0   0         6
                51.41          2.09        1.7773    2   1   0        24
                56.74         24.79        1.6225    2   1   1        24
                66.55         45.06        1.4051    2   2   0        12
                75.67          8.77        1.2568    3   1   0        24
                80.09         10.32        1.1983    3   1   1        24
                84.44         11.82        1.1473    2   2   2         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.