braunite

noun

braun·​ite

ˈbrau̇ˌnīt

plural -s

: a brittle brownish black or steel-gray mineral that consists of manganese silicate and occurs massive and as tetragonal crystals (hardness 6–6.5, specific gravity 4.75–4.82)

Word History

Etymology

Councilor Braun, 19th century German treasury official + English -ite

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