humite

noun

hum·​ite

ˈhyüˌmīt

plural -s

: a white, yellow, brown, or red mineral Mg₇Si₃O₁₂(F₁OH)₂ consisting of a basic magnesium silicate containing fluorine that is brittle and of vitreous to resinous luster, that is found in the masses ejected from Vesuvius and elsewhere, and is related to chondrodite, norbergite, and olivine (hardness 6.–6.5; specific gravity 3.1–3.2)

Word History

Etymology

Sir Abraham Hume †1838 English mineral collector + English -ite

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