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Plagioclase is a solid solution series of feldspar minerals that range from albite to anorthite. It is abundant in igneous and metamorphic rocks, and some varieties are used as gemstones or building materials.
- Silicate
- White
- Vitreous. Pearly on some cleavage faces.
Properties. Plagioclase is the most common and abundant mineral group in the Earth's crust. Part of the feldspar family of minerals, it is abundant in igneous and metamorphic rock, and it is also common as a detrital mineral in sedimentary rock.
- 6–6.5
- Pinacoidal (1), (same H-M symbol)
- Biaxial (+) albite, biaxial (-) anorthite
- Triclinic
Plagioclase Feldspar properties. Typically white to gray, may also range from colorless, through shades of off-white, to yellowish, pink, reddish brown or nearly black. One perfect cleavage and one good cleavage that meet at nearly 90°. Increases from 2.6 to 2.8 depending on amount of calcium.
Aug 11, 2018 · Learn about the structure, composition, properties and occurrence of feldspars, the most common group of alumosilicates on Earth. Find out how plagioclase and K-feldspar differ in their chemical and physical features and how they form in various rocks.
Apr 23, 2023 · Learn about plagioclase feldspar, a series of silicate minerals in feldspar group with variable composition and properties. Find out how to identify, classify, and use plagioclase feldspar in igneous, metamorphic, and sedimentary rocks.
- Vitreous. Pearly on some cleavage faces.
- White
Dec 16, 2022 · Plagioclase, often called plagioclase feldspar, is mostly a solid solution of albite and anorthite, although it may contain up to 10 wt % orthoclase. We call any feldspar with composition near NaAlSi 3 O 8, albite, and one with composition near CaAl 2 Si 2 O 8, anorthite, even if other components are present.
The Plagioclase Feldspars are important rock-forming minerals and occur in numerous mineral environment s. In many instances, it is very hard to tell apart one from another. When a particular Plagioclase Feldspar cannot be identified, it is simply called "Plagioclase" or "Plagioclase Feldspar".
