Sederholmite
      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 0011582

      CELL PARAMETERS:    3.6613   3.6613   5.3562   90.000   90.000  120.000
      SPACE GROUP: P6_3mc    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     62.181
      Density (g/cm3):      7.351
      MAX. ABS. INTENSITY / VOLUME**2:      152.5366923    
      RIR:      6.757
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.14         10.38        3.1708    1   0   0         6
                32.82        100.00        2.7285    1   0   1         6
                44.27         95.31        2.0460    1   0   2         6
                49.81         62.43        1.8306    1   1   0         6
                59.41         16.29        1.5557    1   0   3         6
                60.94         14.99        1.5202    2   0   1         6
                68.82         21.65        1.3643    2   0   2         6
                70.30          6.53        1.3391    0   0   4         1
                81.13          6.11        1.1855    2   0   3         6
                82.47          3.90        1.1695    2   1   1        12
                89.62          6.40        1.0939    2   1   2        12
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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.