GaN
      Wyckoff R W G
      Crystal Structures 1 (1963) 85-237
      Second edition. Interscience Publishers, New York, New York
      Note: wurtzite structure
      _database_code_amcsd 0011546

      CELL PARAMETERS:    3.1800   3.1800   5.1660   90.000   90.000  120.000
      SPACE GROUP: P6_3mc    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     45.242
      Density (g/cm3):      6.146
      MAX. ABS. INTENSITY / VOLUME**2:      133.1355952    
      RIR:      7.054
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                32.51         44.71        2.7540    1   0   0         6
                34.73         37.84        2.5830    0   0   2         1
                36.99        100.00        2.4302    1   0   1         6
                48.31         20.93        1.8840    1   0   2         6
                58.01         28.42        1.5900    1   1   0         6
                63.74         27.67        1.4601    1   0   3         6
                68.09          4.04        1.3770    2   0   0         6
                69.41         24.59        1.3540    1   1   2         6
                70.82         13.27        1.3305    2   0   1         6
                73.30          2.44        1.2915    0   0   4         1
                78.76          4.05        1.2151    2   0   2         6
                82.49          2.54        1.1693    1   0   4         6
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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.