Potassium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 78 K
      Body centered cubic, bcc, structure
      _database_code_amcsd 0011218

      CELL PARAMETERS:    5.2470   5.2470   5.2470   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    144.455
      Density (g/cm3):      0.899
      MAX. ABS. INTENSITY / VOLUME**2:      23.32998429    
      RIR:      8.452
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                23.99        100.00        3.7102    1   1   0        12
                34.18         17.71        2.6235    2   0   0         6
                42.19         34.83        2.1421    2   1   1        24
                49.11          9.94        1.8551    2   2   0        12
                55.37         12.46        1.6592    3   1   0        24
                61.19          2.78        1.5147    2   2   2         8
                66.70         11.81        1.4023    3   2   1        48
                71.99          1.09        1.3118    4   0   0         6
                77.12          3.37        1.2367    4   1   1        24
                77.12          1.69        1.2367    3   3   0        12
                82.15          2.70        1.1733    4   2   0        24
                87.12          2.24        1.1187    3   3   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.