stewartite

noun

stew·​art·​ite

ˈst(y)üə(r)ˌtīt

plural -s

: a mineral consisting of a hydrous phosphate of manganese that is brownish yellow in color, is usually in minute crystals and tufts of fibers, and is found with hureaulite in several pegmatites

Word History

Etymology

Stewart mine, Pala, California, where it was originally found + English -ite

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