AM_Spinel_21 Formula: (Ni.999 Al2.001) O4 Name: Spinel Unit cell: 8.05263 8.05263 8.05263 90.0 90.0 90.0 , V=522.17 Space group: FD3M (227)

Roelofsen J N , Peterson R C , Raudsepp M , American Mineralogist , 77 (1992) p.522-528, Structural variation in nickel aluminate spinel (NiAl2O4), sample quench temperature = 1500 C, initially annealed at 1300 C