Ytterbium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Cubic closest packed, ccp, structure
      _database_code_amcsd 0011164

      CELL PARAMETERS:    5.4862   5.4862   5.4862   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    165.126
      Density (g/cm3):      6.960
      MAX. ABS. INTENSITY / VOLUME**2:      520.6370119    
      RIR:     24.359
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.17        100.00        3.1675    1   1   1         8
                32.64         50.60        2.7431    2   0   0         6
                46.84         34.43        1.9397    2   2   0        12
                55.56         38.67        1.6542    3   1   1        24
                58.26         10.90        1.5837    2   2   2         8
                68.40          4.58        1.3715    4   0   0         6
                75.54         12.87        1.2586    3   3   1        24
                77.87         11.59        1.2268    4   2   0        24
                87.01          8.15        1.1199    4   2   2        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.