Neighborite
      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 studied by neutron diffraction, x = .5
      One of two alternative models
      _database_code_amcsd 0008544

      CELL PARAMETERS:    3.9354   3.9354   3.9354   90.000   90.000   90.000
      SPACE GROUP: Pm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     60.949
      Density (g/cm3):      3.060
      MAX. ABS. INTENSITY / VOLUME**2:      18.20333108    
      RIR:      1.937
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.59         12.00        3.9354    1   0   0         6
                32.17         77.50        2.7827    1   1   0        12
                39.67         60.54        2.2721    1   1   1         8
                46.13        100.00        1.9677    2   0   0         6
                51.96          4.54        1.7600    2   1   0        24
                57.35         30.83        1.6066    2   1   1        24
                67.29         45.62        1.3914    2   2   0        12
                71.99          1.65        1.3118    2   2   1        24
                76.55         13.09        1.2445    3   1   0        24
                81.04          4.96        1.1866    3   1   1        24
                85.47         12.35        1.1361    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.