staurolite

Stau"ro*lite, n. Etym: [Gr. -lite.] (Min.) 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.

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