oligoclase

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English[edit]

Etymology[edit]

From oligo- +‎ clase

Oligoclase

Noun[edit]

oligoclase (usually uncountable, plural oligoclases)

  1. (mineralogy) 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.

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