Oligoclase vs. Plagioclase

Oligoclase vs. Plagioclase — Is There a Difference?
ADVERTISEMENT

Difference Between Oligoclase and Plagioclase

Oligoclasenoun

(mineral) 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.

Plagioclasenoun

(mineral) Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.

Oligoclasenoun

any of a rock-forming series of triclinic feldspars

Plagioclasenoun

any of a rock-forming series of triclinic feldspars

ADVERTISEMENT