plagioclase Hear it!

plagioclase definition

pla·gio·clase (plā′jē ō klās′)

noun

any of a series of triclinic feldspars, ranging in composition from albite to anorthite and found in many rocks

Etymology: Ger plagioklas < Gr plagios (see plagio-) + klasis, a cleaving, fracture < klaein, to break: see clastic

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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