Uvarovite from chromite-bearing ultramafic intrusives, Orissa, India, a crystal-chemical characterization using (super 57) Fe Moessbauer spectroscopy

EPMA analyses of uvarovite from the chromite-bearing ultramafic intrusive of Sukinda, India, show that uvarovite containing 9.83 to 17.68 wt% Cr (sub 2) O (sub 3) represents a solid solution of the binary uvarovite-andradite series with Uva (sub 34-58) And (sub 42-58) Associated chromite grains with 57-59 wt% Cr (sub 2) O (sub 3) do not show any compositional variation from core to rim. (super 57) Fe Mossbauer spectroscopic studies on the uvarovite samples undertaken both at room temperature (298 K) and low temperature (110 K) indicate the presence of Fe (super 3+) only in octahedral coordination. Uvarovite grew from chromite (Cr source) and pyroxenes (Al, Fe, and Ca source) of the ultramafic host rocks.