oligoclase en · NOUN
Etymology
From oligo- + -clase.
Meanings
- (uncountable, usually) 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.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| oligoclases | Number=Plur | lexicographic |
Relateds
rock · feldspar · plagioclase