La Na S2
      Ballestracci R, Bertaut E
      Bulletin de la Societe Francaise de Mineralogie et de Cristallographie 87 (1964) 512-517
      Etude crystallographique de sulfures de terres rares et de sodium
      _cod_database_code 1008968
      _database_code_amcsd 0016831

      CELL PARAMETERS:    5.8810   5.8810   5.8810   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    203.401
      Density (g/cm3):      3.690
      MAX. ABS. INTENSITY / VOLUME**2:      89.96049193    
      RIR:      7.938
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                26.25         29.91        3.3954    1   1   1         8
                30.40        100.00        2.9405    2   0   0         6
                43.53         65.84        2.0792    2   2   0        12
                51.54         12.92        1.7732    3   1   1        24
                54.01         20.84        1.6977    2   2   2         8
                63.25          8.83        1.4703    4   0   0         6
                69.69          4.15        1.3492    3   3   1        24
                71.78         22.40        1.3150    4   2   0        24
                79.91         15.55        1.2005    4   2   2        24
                85.87          1.90        1.1318    5   1   1        24
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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.