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Potassium feldspar refers to a number of minerals in the feldspar group, and containing potassium: Orthoclase (endmember formula K Al Si 3 O 8), an important tectosilicate mineral that forms igneous rock; Microcline, chemically the same as orthoclase, but with a different crystalline structure
- Feldspar - Wikipedia
Feldspar (/ ˈ f ɛ l (d) ˌ s p ɑːr / FEL(D)-spar; sometimes...
- Orthoclase - Wikipedia
Orthoclase, or orthoclase feldspar (endmember formula K Al...
- Feldspar - Wikipedia
Potassium feldspars are the feldspar minerals in which the silicate tetrahedral and aluminum tetrahedra are bound with potassium ions, rather than sodium or calcium ions as in the plagioclase feldspar subgroup.
- KAlSi308-Potassium Aluminum Silicate
- 6 (harder than glass)
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Formula: KAlSi 3 O 8 Monoclinic or Triclinic. Description: Potassium feldspar refers to any of the three polymorphs microcline, orthoclase or sanidine. The distinction between these minerals can be made with certainty only after detailed X-Ray analysis.
Apr 4, 2024 · feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth’s crust, and professional literature about them constitutes a large percentage of the literature of mineralogy.
Chemical composition. All the rock-forming feldspars are alumino silicate minerals with the general formula AT4 O 8 in which A = potassium, sodium, or calcium (Ca); and T = silicon (Si) and aluminum (Al), with a Si:Al ratio ranging from 3:1 to 1:1.
