Oligoclase

noun

Definitions

Noun
  1. 1
    A plagioclase feldspar, the second member of the Albite-Anorthite solid solution series. Primarily found as small crystals in impure marble. Oligoclase contains a small amount of calcium substituting for some of the sodium in its formula. Oligoclase with reddish-golden inclusions found in Norway and Canada is called sunstone. uncountable, usually
  2. 2
    any of a series of triclinic feldspars that form rocks wordnet

Etymology

From oligo- + -clase.

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