English

Noun

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.

See also

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

Anagrams

• sociolegal