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Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. Oligoclase is a high sodium feldspar crystallizing in the triclinic system. The Mohs hardness is 6 to 6.5 and the specific gravity is 2.64 to 2.66. — “Oligoclase - Wikipedia, the free encyclopedia”, en.wikipedia.org
The name oligoclase is derived from the Greek for little and fracture, in reference to from 90°. Sunstone is mainly oligoclase (sometimes albite) with flakes of hematite. — “Plagioclase - Wikipedia, the free encyclopedia”, en.wikipedia.org
oligoclase, other plagioclase. Trondhjemite is a leucocratic (light-colored) intrusive It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase. — “Trondhjemite - Wikipedia, the free encyclopedia”, en.wikipedia.org