The spinel-type oxides with cubic structure and refer to the metal cations on tetrahedral and octahedral sites. Respectively have been attracting much scientific and technological attention . the main interest to study these materials comes from geophysics . technological applications and fundamental physics . these spinel oxides occur in many geological settings of the earth’s crust and mantle, as well as in lunar rocks and meteorites . the study of their high-pressure structural properties is important for improving our understanding of the Constituents Of the Earth. The density of oxides under high-pressure high-temperature conditions. Ringwood and reid reported that AAI2O4 Spinels decompose into ######### ,and rocksalt-type oxide AO at 12 GPa and 1000-1200 ‘C at higher pressures MgAI2O4 material with the CaFe2O4 – type structure is formed Recent work showed that another post-spinel structure of MgAL2O4 is stable at pressures between 45 and 117 GPa