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[ol-i-goh-kleys] /ˈɒl ɪ goʊˌkleɪs/

noun, Mineralogy.
a kind of plagioclase feldspar occurring commonly in white crystals, sometimes shaded with gray, green, or red.
a white, bluish, or reddish-yellow feldspar mineral of the plagioclase series, consisting of aluminium silicates of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
(ŏl’ĭ-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.


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