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oligoclase

noun

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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Meanings

nounoligoclase (usually uncountable, plural oligoclases)

plural oligoclases

uncountableusuallychemistryA 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.

Synonyms & antonyms

nounany of a series of triclinic feldspars that form rocks

Similar

Broader

feldspar felspar

Also see

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

From oligo- + -clase.

Full word history & related roots →

Rhymes & wordplay

Anagrams

Cite this entry

APA

oligoclase. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/oligoclase

MLA

“oligoclase.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/oligoclase. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “oligoclase,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/oligoclase.

Source: oligoclase on Wiktionary, CC BY-SA 4.0.