What does "oligoclase" mean?

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.

What is a synonym for "oligoclase"?

Common synonyms include: plagioclase, plagioclase.

Oligoclase

noun

noun ·Rare ·Advanced level

Definitions

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. uncountable, usually
2
any of a series of triclinic feldspars that form rocks wordnet

Synonyms

All synonyms

plagioclase plagioclase

Etymology

From oligo- + -clase.

Related phrases

solid solution

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.