English Explanatory Dictionary

oligoclase

English dictionary entry

Meanings

noun
  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.

Word forms

oligoclase oligoclases

Etymology

From oligo- + -clase.

Related words

rock feldspar plagioclase
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