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oligoclase

[ ol-i-goh-kleys ]
/ ˈɒl ɪ goʊˌkleɪs /
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noun Mineralogy.

a kind of plagioclase feldspar occurring commonly in white crystals, sometimes shaded with gray, green, or red.

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Origin of oligoclase

First recorded in 1825–35; oligo- + -clase
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for oligoclase

oligoclase
/ (ˈɒlɪɡəʊˌkleɪs) /

noun

a white, bluish, or reddish-yellow feldspar mineral of the plagioclase series, consisting of aluminium silicates of sodium and calcium. Formula: NaAlSi 3 O 8 .CaAl 2 Si 2 O 8
C19: from oligo- + -clase
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for oligoclase

oligoclase
[ ŏlĭ-gō-klās′, ō′lĭ- ]

A white to gray triclinic mineral of the plagioclase feldspar group. Oligoclase occurs in igneous rocks with a relatively high silica content, such as granite. Chemical formula: (Na,Ca)(Al,Si)AlSi2O8.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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