ilvaite

noun

il·​va·​ite

ˈilvəˌīt

plural -s

: a silicate CaFe₃Si₂O₈(OH) of iron and calcium and sometimes manganese related to epidote and occurring in black prismatic crystals and columnar masses (hardness 5.5–6, specific gravity 4.0)

Word History

Etymology

German ilvait, from Ilva (Elba), Italian island in the Mediterranean + German -it -ite

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