ˈhyüˌmīt noun
( -s )
Etymology: Sir Abraham Hume died 1838 English mineral collector + English -ite
: a white, yellow, brown, or red mineral Mg 7 Si 3 O 12 (F 1 OH) 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)