oligoclase Hear it!

oligoclase definition

oli·go·clase (-klās′)

noun

a plagioclase feldspar whose composition corresponds to 70 to 90 percent albite

Etymology: Ger oligoklas < Gr oligos (see oligo-) + klasis, a fracture (see clastic), in contrast to orthoclase, because cleavage differs slightly from 90°

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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