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oligoclase::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Synonyms | plagioclase |
| Type of | felspar, feldspar |
| Has types | white feldspar, anorthite, albite |
Examples of oligoclase
oligoclase
Oligoclase and biotite schist have also been pushed to the surface of the Earth.
From the en.wikipedia.org
In the acid rocks the common feldspars are orthoclase, perthite, microcline, and oligoclase-all having much silica and alkalis.
From the en.wikipedia.org
This is coloured yellow brown to pink and contains fine crystals of perthite, and oligoclase and quartz, coloured by limonite.
From the en.wikipedia.org
- Plagioclase: any of a series of triclinic feldspars that form rocks
- Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters it is intermediate between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8). The albite : anorthite molar ratio ranges from 90 : 10 to 70 : 30.
- 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. ...
- Is characteristic of granodiorites and monzonites. It may also have a sparkle owing to inclusions of hematite, in which case it is called sunstone. Oligoclase is found in metamorphic rocks formed under moderate temperature conditions such as amphibolite facies.
