Orthoclase - Wikipedia
It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed of orthoclase.
Potassium Feldspar | Common Minerals
Within the potassium feldspar group, the occurrence of each potassium feldspar member varies slightly. Orthoclase is the most common potassium feldspar, forming the majority of potassium feldspar found in felsic plutonic igneous rocks, some high temperature veins, and higher-grade metamorphic rocks.
Orthoclase Mineral Physical-Optical Properties, Uses, Occurrence
2023年4月23日 · An important rock-forming mineral, orthoclase is the potassium-bearing end member of the potassium sodium feldspar solid-solution series. It is a major component of granite its pink crystals give granite its typical color.
Orthoclase Mineral Data
Orthoclase. Comments: Gemmy, twinned adularia (orthoclase) specimen on matrix. Former Bally Museum collection. Location: Rhonegletscher, Switzerland. Scale: Crystal size 3 x 2 cm. © Fabre Minerals
Orthoclase: Pink granite, Mohs hardness and moonstone - Geology.com
Because orthoclase is rich in potassium and an end member of the alkali feldspar series, many geologists call it "K-spar," "K-feldspar" or "potassium feldspar."
Potassium feldspar - Wikipedia
Potassium feldspar refers to a number of minerals in the feldspar group that contain large amounts of potassium in the crystal lattice. Orthoclase ( endmember formula K Al Si 3 O 8 ), an important tectosilicate mineral that forms igneous rock
There are four varieties of K-feldspar (three of which we must be able to identify in this lab using the optical and physical properties of each): Microcline, Orthoclase, Sanidine, and Adularia.
Potassium Feldspar – WGNHS – UW–Madison
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. This has not kept the terms from being used freely in …
The Mineral orthoclase - The Mineral and Gemstone Kingdom
Detailed description, properties, locality information guide about the potassium feldspar mineral orthoclase and adularia.
Orthoclase | Feldspar, Silicate, Mohs Scale | Britannica
Orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi3O8); it usually occurs as variously coloured, frequently twinned crystals in granite. Orthoclase is used in the manufacture of glass and ceramics; occasionally, transparent crystals are cut as gems.
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