Oligoclase Definition
ŏlĭ-gō-klās, -klāz, ōlĭ-
noun
A plagioclase feldspar whose composition corresponds to 70 to 90 percent albite.
Webster's New World
A white, gray, green or red variety of plagioclase feldspar that contains a higher proportion of sodium than calcium and is common in silica-rich igneous rocks.
American Heritage
Synonyms:
Origin of Oligoclase
-
oligo– Greek klasis cleavage (from klān to break plagioclase feldspar)
From American Heritage Dictionary of the English Language, 5th Edition
From oligo- +"Ž clase
From Wiktionary
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