Dictionarypi•geon•itePronunciation: (pij'u-nīt"), [key] —n. Mineral. a monoclinic variety of pyroxene consisting mainly of a mixture of (MgFe)SiO3 and CaMg(SiO3)2. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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