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Meaning of staurolite

stau•ro•lite

Pronunciation: (stôr'u-līt"), [key]
— n.
  1. a mineral, basic iron aluminum silicate, FeAlO(SiO)(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.