Neptunium-alpha
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample is stable at room conditions
      _database_code_amcsd 0011263

      CELL PARAMETERS:    4.7230   4.8870   6.6630   90.000   90.000   90.000
      SPACE GROUP: Pmcn      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    153.791
      Density (g/cm3):     20.469
      MAX. ABS. INTENSITY / VOLUME**2:      916.7331921    
      RIR:     14.583
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                26.24          1.12        3.3962    1   1   0         4
                26.76          2.07        3.3315    0   0   2         2
                29.52         30.85        3.0258    1   1   1         8
                32.53         43.43        2.7527    0   1   2         4
                32.90          3.96        2.7224    1   0   2         4
                36.78         21.89        2.4435    0   2   0         2
                37.83        100.00        2.3783    1   1   2         8
                38.11         49.21        2.3615    2   0   0         2
                39.27         11.59        2.2941    0   2   1         4
                43.87         24.59        2.0635    1   2   1         8
                44.82          7.99        2.0220    0   1   3         4
                46.07          3.67        1.9703    0   2   2         4
                50.95         22.28        1.7923    2   1   2         8
                54.00         13.07        1.6981    2   2   0         4
                55.87          7.47        1.6455    2   2   1         8
                55.95          2.27        1.6435    0   2   3         4
                58.78         19.13        1.5709    1   0   4         4
                59.56          2.79        1.5522    1   2   3         8
                60.08          4.22        1.5400    1   3   0         4
                60.26          5.94        1.5359    2   1   3         8
                61.27          2.81        1.5129    2   2   2         8
                61.83         11.35        1.5004    1   3   1         8
                62.06          5.41        1.4955    1   1   4         8
                63.65          2.83        1.4620    3   1   1         8
                66.94          2.14        1.3979    1   3   2         8
                68.68         14.05        1.3666    3   1   2         8
                69.71          2.11        1.3490    2   2   3         8
                71.38          7.17        1.3214    1   2   4         8
                71.87          6.84        1.3136    0   3   3         4
                72.87          4.41        1.2981    3   2   1         8
                81.52          4.00        1.1808    4   0   0         2
                82.44          1.82        1.1699    0   2   5         4
                82.90          5.09        1.1646    1   4   1         8
                84.38          8.17        1.1479    2   3   3         8
                84.46          1.39        1.1470    0   4   2         4
                84.72          5.60        1.1442    3   0   4         4
                85.51          3.28        1.1356    1   2   5         8
                85.84          1.29        1.1321    3   3   0         4
                87.38          3.64        1.1161    3   3   1         8
                87.52          1.74        1.1146    1   4   2         8
                87.58          1.74        1.1140    3   1   4         8
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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.