AM_Neptunium-alpha Formula: Np Name: Neptunium-alpha Unit cell: 4.723 4.887 6.663 90.0 90.0 90.0 , V=153.79 Space group: PMCN (62)

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