Oligoclase Definition

ŏlĭ-gō-klās, -klāz, ōlĭ-
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

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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