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stewartite

noun
stew·​art·​ite | \ ˈst(y)üə(r)ˌtīt\
plural -s

Definition of stewartite

: 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

History and Etymology for stewartite

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

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