Niggliite
      Wyckoff R W G
      Crystal Structures 1 (1963) 85-237
      Second edition. Interscience Publishers, New York, New York
      Note: ideal nickel arsenide structure
      _database_code_amcsd 0011591

      CELL PARAMETERS:    4.1030   4.1030   5.4280   90.000   90.000  120.000
      SPACE GROUP: P6_3mc    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     79.136
      Density (g/cm3):     13.167
      MAX. ABS. INTENSITY / VOLUME**2:      617.3102568    
      RIR:     15.266
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                25.06         57.12        3.5533    1   0   0         6
                30.06         42.20        2.9729    1   0   1         6
                33.00          2.95        2.7140    0   0   2         1
                41.89        100.00        2.1568    1   0   2         6
                44.15         64.60        2.0515    1   1   0         6
                51.43          7.68        1.7767    2   0   0         6
                54.33          6.91        1.6885    2   0   1         6
                56.21          3.87        1.6366    1   1   2         6
                57.13          5.82        1.6123    1   0   3         6
                62.48         27.49        1.4865    2   0   2         6
                69.24          4.87        1.3570    0   0   4         1
                70.06          5.63        1.3430    2   1   0        12
                72.50          5.07        1.3037    2   1   1        12
                74.91          4.56        1.2677    1   0   4         6
                74.91          2.27        1.2677    2   0   3         6
                79.65         24.84        1.2037    2   1   2        12
                81.22          8.77        1.1844    3   0   0         6
                85.87         15.02        1.1318    1   1   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.