Crystal-chemical transformations in chromic ores of the Rai-Iz massif at oxidizing roasting

Phase and chemical changes in chromic ore of the Rai-Iz massif in conditions of oxidizing roasting at temperature of 1000 °C are investigated. With micro X-ray spectroscopic analysis the changes of the elements content in chromium spinellide and enclosing rock were found out. The diffusion of iron and magnesium oxides from chromium spinellide into magnesium silicate of enclosing rock was investigated. The Cr/Fe ratio increasing in chromium spinellide was experimentally established as function from time of oxidizing roasting. The generation of the olivine and forsterite in initial magnesium silicate was found out too.