seamanite

noun

sea·​man·​ite

ˈsēməˌnīt

plural -s

: a rare mineral Mn₃(PO₄)(BO₃).3H₂O that is a phosphate and borate of manganese and that occurs in pale yellow orthorhombic crystals

Word History

Etymology

Arthur E. Seaman †1937 American geologist + English -ite

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