Meaning of valentinite

val•en•tin•ite

Pronunciation: (val'un-ti-nīt", -tē"nīt), [key]
— n.
  1. a mineral, antimony trioxide, SbO, formed by the oxidation of various minerals containing antimony and occurring in the form of white orthorhombic crystals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.