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Structural and compositional study of natural chromites of Indian origin

Natural chromites taken from three Indian localities, Sukinda, Ladakh and Byrapur, have been studied by Mossbauer spectroscopy. Microscopical and chemical analyses have also been made. Of the four samples studied, three showed normal structure while one showed an inverse spinel structure with small particle size, which indicates that it crystallised at a higher temperature with a faster rate of cooling of the magma. This fourth sample had also suffered hydrothermal alterations. The Fe3+/Fe2+ ratio demonstrates a high oxygen fugacity at the time of formation of all the samples. The Mg/Fe2+ and Cr/Fe ratios suggest that the chromite from Sukinda was the earliest to be crystallised and that the samples from Byrapur were the latest.