Abstract

Mn-rich minerals of the pumpellyite group are developed in Mn oxide ores of the Precambrian Sausar Group, India. The ores were intruded by late pegmatite dikes and calcite veins. A hydrothermal origin for these phases through Ca-Mg-Fe-Al metasomatism is evident from their mode of occurrence and textures. The phases studied show wide- spread substitution between Mn3+ and Al in the Y-site and between Mn2+ and Mg in the X-site. An Mg equivalent of okhotskite, reported for the first time, is present. This study establishes that okhotskite represents the Mn3+ end-member of the pumpellyite group of minerals and that solid solution between pumpellyite (Al dominant) and okhotskite is nearly complete.

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