noun ·Rare ·Advanced level

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

Synonyms

All synonyms

plagioclaseplagioclase feldsparsodium plagioclasesodium rich plagioclase

Antonyms

All antonyms

albiteanorthite

Etymology

From oligo- + -clase.