Staurolite
Pronunciation : Stau"ro*lite
Part of Speech : n.
Etymology : [Gr. -lite.] (Min.)
Definition : Defn: A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.
Source : Webster's Unabridged Dictionary, 1913