a green, brown, or yellow mineral consisting of a hydrated silicate of calcium, magnesium, iron, and aluminium: it occurs as tetragonal crystals in limestones and is used as a gemstone. Formula: Ca10(Mg,Fe)2Al4Si9O34(OH)4
Also called: idocrase, vesuvian
Word origin
C19: first found in the lava of Vesuvius
vesuvianite in American English
(vəˈsuviəˌnaɪt)
noun
a usually green or brown, hard, tetragonal mineral, Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4, usually found in metamorphic limestone; hydrous calcium magnesium aluminum silicate