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axinite

noun
ax·​i·​nite | \ˈaksəˌnīt\
plural -s

Definition of axinite 

: 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)

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History and Etymology for axinite

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

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