Na Pr 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 1008970
      _database_code_amcsd 0016833

      CELL PARAMETERS:    5.7770   5.7770   5.7770   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    192.800
      Density (g/cm3):      3.927
      MAX. ABS. INTENSITY / VOLUME**2:      100.8552611    
      RIR:      8.362
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                26.73         32.88        3.3354    1   1   1         8
                30.96        100.00        2.8885    2   0   0         6
                44.35         65.40        2.0425    2   2   0        12
                52.54         13.88        1.7418    3   1   1        24
                55.07         20.54        1.6677    2   2   2         8
                64.52          8.66        1.4442    4   0   0         6
                71.14          4.37        1.3253    3   3   1        24
                73.28         21.90        1.2918    4   2   0        24
                81.65         15.23        1.1792    4   2   2        24
                87.80          2.00        1.1118    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.