manganosite

noun

man·​ga·​no·​site

ˌmaŋgəˈnōˌsīt,

manˈganəˌ-

plural -s

: a mineral MnO consisting of manganous oxide occurring in small emerald green octahedrons that turn black on exposure (hardness 5–6, specific gravity 5.18)

Word History

Etymology

German manganosit, from mangan- + connective -s- + -it -ite

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