oligoclase

From oligo- +‎ -clase.

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.

• oligoclase on Wikipedia.Wikipedia
• rock
• feldspar
• plagioclase

• David Barthelmy (1997–2024) “Oligoclase”, in Webmineral Mineralogy Database.
• “oligoclase”, in Mindat.org‎, Hudson Institute of Mineralogy, 2000–2024.

• sociolegal

oligoclase f (plural oligoclases)

1. oligoclase

• “oligoclase”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.