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Orthoclase - Wikipedia
Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture", because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K … See more
Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite.
Typically, the pure … See moreWikipedia text under CC-BY-SA license Feldspar - Wikipedia
Feldspar is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust and 41% of the Earth's continental crust by we…
Wikipedia · Text under CC-BY-SA licensePotassium feldspar - Wikipedia
WEBPotassium 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 …
Orthoclase | NOVA Mineralogy - nvcc.edu
WEBOrthoclase is frequently known as potassium feldspar or K-spar, and is easily distinguished from the plagioclase feldspars in hand sample by its …
- Chemical formula: KAlSi 3 O 8
- Crystal system: Monoclinic
Potassium Feldspar | Common Minerals
WEBPotassium 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.
Orthoclase - Wikiwand
WEBOrthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for …
Potassium Feldspar – WGNHS – UW–Madison
WEBPotassium Feldspar. Pink K feldspar crystal with quartz. Wimmer Pit, near Wausau, Marathon County, WI. Crystal is about 4 cm. (Photo by W. Cordua.) Formula: KAlSi 3 O …
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Search - 6.4.3: Feldspars - Geosciences LibreTexts
WEBDec 16, 2022 · Feldspars with compositions close to KAlSi 3 O 8 are generally called K-feldspar, or K-spar. But, K-feldspar has three polymorphs with slightly different atomic arrangements: orthoclase, …
Feldspar Distinctions, Characteristics, and …
WEBAug 10, 2019 · Alkali feldspar (also called potassium feldspar or K-feldspar) has a color range from white to brick-red, and it's typically opaque. Many rocks have both feldspars, like granite. Cases like that …
Feldspar | Properties, Uses, Types, & Facts | Britannica
WEBAug 6, 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 …
The hidden world of K-feldspars: do we really know what
WEBMar 20, 2022 · PDF | Ten K-feldspar samples from the Devonian Mattamiscontis Mountain, Seboeis Lake, Center Pond, and Passadumkeag River plutons in east-central …
Feldspars - all about the plagioclases and K-feldspars
WEBAug 11, 2018 · Feldspars are present in almost all magmatic and metamorphic rocks, but are less common in sedimentary rocks because of their low mechanical and chemical …
Alkali feldspar granite - Wikipedia
WEBAlkali feldspar granite, some varieties of which are called 'red granite', [1] is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense …
Potassium feldspar | mineral | Britannica
WEBpotassium feldspar. mineral. Also known as: K-feldspar, K-spar. Learn about this topic in these articles: classification. In feldspar: Chemical composition. Microcline and …
K-Feldspar mineral - digitalfire.com
WEBK-Feldspar. Most common feldspars contain both sodium and potassium. The term K-Feldspar designates one where the K 2 O/Na 2 O balance heavily favors K 2 O. Related …
16.10: Feldspar - Geosciences LibreTexts
WEBFeldspars are divided into two types: K-feldspars (potassium feldspars) Plagioclase feldspars (an isomorphous series between albite and anorthite) Figure \(\PageIndex{1}\)
Feldspars - Encyclopedia.com
WEBMay 8, 2018 · feldspars The most important group of rock-forming silicate minerals, including the alkali feldspars KAlSi 3 O 8 to NaAlSi 3 O 8 (K-feldspar to albite) and the …
Feldspar - The Canadian Encyclopedia
WEBFeb 7, 2006 · Feldspar occurs mostly as white, green or red-brown, ranging from flesh colour to the colour of brick. A special type of feldspar is extracted from pegmatites in …
Microcline - Wikipedia
WEBIt is a fully ordered triclinic modification of potassium feldspar and is dimorphous with orthoclase. Microcline is identical to orthoclase in many physical properties, and can be …
Orthoclase - Wikiwand
WEBOrthoclase, or orthoclase feldspar ( endmember formula K Al Si 3 O 8 ), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for …
Feldspars - SpringerLink
WEBJan 1, 2015 · Feldspars are the most ubiquitous minerals in the Earth’s crust. They are unique dating targets, in the fields of luminescence and K-Ar/Ar-Ar geochronology, as …
Feldspar: The common mineral that’s always wet
WEBFeb 2, 2024 · Feldspar: The common mineral that’s always wet. An investigation of the atomic surface of certain feldspars reveals why those minerals bond with water so …
Anorthoclase - Wikipedia
WEBThe mineral anorthoclase ((Na,K)AlSi 3 O 8) is a crystalline solid solution in the alkali feldspar series, in which the sodium-aluminium silicate member exists in larger proportion.
Parallelogram - Wikipedia
WEBIn Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal …
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