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orthoclase

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Orthoclase - Wikipedia
Orthoclase, or orthoclase feldspar (endmember formula KAlSi 3 O 8 ), 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. en.wikipedia.org
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Orthoclase: Mineral information, data and localities.
Orthoclase is the most common member of the series, being the dominant K-feldspar in most granite, granitic rocks and other plutonic rocks, with an intermediate ... www.mindat.org
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Orthoclase Feldspar - Minerals - Geology.com
Orthoclase is a feldspar mineral with a chemical composition of KAlSi 3 O 8. It is one of the most abundant rock-forming minerals of the continental crust. geology.com
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orthoclase
orthoclase Min. (ˈɔːθəkleɪs) [mod. (Breithaupt, 1823) f. ortho- ‘straight, right’ + Gr. κλάσ-ις breaking, cleavage.] Common or potash feldspar, a silicate of aluminium and potassium, occurring in crystals or masses of various colours, characterized by two cleavages at right angles to each other.1849... Oxford English Dictionary
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Orthoclase Meanings and Crystal Properties
Orthoclase, also known as K-spar and K-feldspar, is a common potassium feldspar mineral that crystallizes in the form of masses, small prismatic shards, ... thecrystalcouncil.com
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Orthoclase Mineral Data - Mineralogy Database
General Orthoclase Information. Help on Chemical Formula: Chemical Formula: KAlSi3O8. Help on Composition: Composition: Molecular Weight = 278.33 gm. webmineral.com
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Orthoclase - rocks and minerals - The University of Auckland
Orthoclase is found in silica-rich igneous rocks such as granite, and in high grade metamorphic rocks. Chemical composition - KAlSi 3O 8. Hardness - 6 rocksminerals.flexiblelearning.auckland.ac.nz
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[PDF] Orthoclase KAlSi3O8 - RRuff
Crystal Data: Monoclinic. Point Group: 2/m. Crystals commonly short prismatic along. [100] or [001], tabular on [010], to 20 cm. rruff.geo.arizona.edu
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Orthoclase | Feldspar, Silicate, Mohs Scale - Britannica
Orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi 3 O 8 ); it usually occurs as variously coloured, frequently twinned crystals in ... www.britannica.com
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Orthoclase - - Clark Science Center
Found in granite, granodiorite, syenite, and other felsic rocks. Also found in arkoses and certain contact and regional metamorphic rocks. Usually found with ... www.science.smith.edu
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Oligoclase
Oligoclase occurs, often accompanying orthoclase, as a constituent of plutonic igneous rocks such as granite, syenite, and diorite. The distinctive texture of rapakivi granite is due to oligoclase rims on orthoclase phenocrysts. wikipedia.org
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Theralite
Essexites Essexite is a form of silica-undersaturated pyroxene gabbro, containing nepheline and orthoclase as essential constituents, though often in The presence of orthoclase indicates a petrogenetic difference with nepheline gabbros. wikipedia.org
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Argillic alteration
Orthoclase is generally stable and unaffected. wikipedia.org
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Unakite
Unakite is a metamorphic rock that is altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. The dominant green epidote in unakite rocks is the metasomatic alteration product of plagioclase feldspar, while the orthoclase and quartz crystals remain wikipedia.org
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Essexite
Higher than normal potassium favors the production of orthoclase, which is usually absent from most mafic igneous rocks. The presence of orthoclase indicates that it contains sufficient potassium to favor production of orthoclase over microcline or potassic oligoclase. wikipedia.org
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