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Natural chromite minerals form extended solid solutions with binary spinels of FeCr2O4, MgCr2O4, FeAl2O4, and MgAl2O4. The decomposition of natural spinels strongly depends upon the chemical potential imposed in the forms of temperature, pressure, and pH difference in aqueous media (e.g., during natural weathering). In this investigation, we studied the thermal decomposition behavior of South African...