Potassium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 5 K
      Body centered cubic, bcc, structure
      _database_code_amcsd 0011217

      CELL PARAMETERS:    5.2250   5.2250   5.2250   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    142.646
      Density (g/cm3):      0.910
      MAX. ABS. INTENSITY / VOLUME**2:      23.65074103    
      RIR:      8.461
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                24.09        100.00        3.6946    1   1   0        12
                34.33         17.67        2.6125    2   0   0         6
                42.37         34.68        2.1331    2   1   1        24
                49.33          9.89        1.8473    2   2   0        12
                55.62         12.38        1.6523    3   1   0        24
                61.48          2.76        1.5083    2   2   2         8
                67.02         11.73        1.3964    3   2   1        48
                72.34          1.09        1.3062    4   0   0         6
                77.51          3.35        1.2315    4   1   1        24
                77.51          1.68        1.2315    3   3   0        12
                82.58          2.69        1.1683    4   2   0        24
                87.58          2.23        1.1140    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.