Argon
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 4.2 K
      Cubic closest packed, ccp, structure
      _database_code_amcsd 0011139

      CELL PARAMETERS:    5.2560   5.2560   5.2560   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    145.200
      Density (g/cm3):      1.827
      MAX. ABS. INTENSITY / VOLUME**2:      32.37077117    
      RIR:      5.769
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.43        100.00        3.0346    1   1   1         8
                34.12         47.20        2.6280    2   0   0         6
                49.02         26.60        1.8583    2   2   0        12
                58.22         27.90        1.5847    3   1   1        24
                61.07          7.76        1.5173    2   2   2         8
                71.85          3.22        1.3140    4   0   0         6
                79.48          9.21        1.2058    3   3   1        24
                81.98          8.39        1.1753    4   2   0        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.