Iridium
      Owen E A, Yates E L
      Philosophical Magazine 15 (1933) 472-488
      Precision measurements of crystal parameters
      Locality: synthetic
      Sample: at T = 18C
      Note: lattice parameter is mean value of 3 radiation types
      _database_code_amcsd 0014950

      CELL PARAMETERS:    3.8312   3.8312   3.8312   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     56.235
      Density (g/cm3):     22.700
      MAX. ABS. INTENSITY / VOLUME**2:      1913.055986    
      RIR:     27.441
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                40.79        100.00        2.2119    1   1   1         8
                47.46         46.62        1.9156    2   0   0         6
                69.38         25.20        1.3545    2   2   0        12
                83.73         26.88        1.1552    3   1   1        24
                88.38          7.67        1.1060    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.