axinite

noun

ax·​i·​nite

ˈaksəˌnīt

plural -s

: a mineral Ca₂(MnFe)Al₂BSi₄O₁₅OH, consisting of borosilicate of aluminum and calcium with varying amounts of iron and manganese commonly in brown glassy sharp-edged triclinic crystals (hardness 6.5–7, specific gravity 3.27–3.29)

Word History

Etymology

French, from Greek axinē axhead, ax + French -ite; from its ax-shaped crystals

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