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plagioclase::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Synonyms | oligoclase |
| Type of | felspar, feldspar |
| Has types | white feldspar, anorthite, albite |
| Derivation | plagioclastic |
Examples of plagioclase
plagioclase
Less commonly, plagioclase crystals are megacrystic, or larger than one metre long.
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The crag itself exposes the plagioclase-phyric andesitelavas of the Birker Fell Formation.
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Plagioclase, quartz, gypsum, and spinel often exhibit contact twinning.
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Porphyritic andesite is dark grey with white crystals of plagioclase feldspar embedded.
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It has more biotite and plagioclase than Shannons Flat Granodiorite.
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Up to half of the rock is plagioclase feldspar with the rest being ferromagnesian minerals.
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In addition to albite, barium feldspars are also considered both alkali and plagioclase feldspars.
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True granite according to modern petrologic convention contains both plagioclase and alkali feldspars.
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When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali granite.
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- Any of a series of triclinic feldspars that form rocks
- Plagioclase is an important series of tectosilicate minerals within the feldspar family. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a solid solution series, more properly known as the plagioclase feldspar series (from the Greek "oblique ...
- A triclinic mineral with the general chemical composition of Al2Si2O8
- Class of common rock-forming minerals within the group of feldspars, including albite, oligoclase, andesine, labradorite, bytownite, and anorthite.
- Common rock-forming series of feldspar: (Na1-x,Cax)(Alx,Si1-x)Si2O8, where x = 0 to 1. The Ca-rich end-member is called anorthite; the Na-rich is albite.
- A member of the feldspar family consisting of a compositionally continuous series between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8).
- A common rock-forming silicate that is part of the feldspar group, often white to gray in color. It ranks #6 on the Mohrs scale of hardness. Composed of sodium, calcium, alumninum, silicon, and oxygen.
- Silicates of aluminium with calcium and sodium, a member of the feldspar family; an important constituent of many plutonic and volcanic rocks.
- Calcium (Ca) feldspar, CaAl2Si2O8.
