ˈilvəˌīt noun
( -s )
Etymology: German ilvait, from Ilva (Elba), Italian island in the Mediterranean + German -it -ite
: a silicate CaFe 3 Si 2 O 8 (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)