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  • Feldspar | Definition of Feldspar by Merriam-Webster

    May 01, 2018 · Feldspar definition is - any of a group of crystalline minerals that consist of aluminum silicates with either potassium, sodium, calcium, or barium and that are an essential constituent of nearly all crystalline rocks.

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  • Feldspar | Minerals Education Coalition

    Feldspar: 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. Learn more about the properties and uses of feldspar in this article.

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  • Feldspar minerals make up over 50% of Earth's crust.

    Feldspar mineral classification: This ternary diagram shows how feldspar minerals are classified on the basis of their chemical composition. The sequence of minerals along the left side of the triangle represents the solid solution series of the alkali feldspars. The sequence along the base is the solid solution series of the plagioclase feldspars.

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  • Feldspar - definition of feldspar by The Free Dictionary

    Quartz, feldspar and chlorite minerals indicated that the sediments were transported from igneous and metamorphic rocks and the hematite and goethite indicated …

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  • What is Feldspar? (with pictures) - wisegeek.com

    Feb 22, 2019 · Feldspar is a blanket term for a very large group of minerals that are extremely abundant on Earth. Around 60% of the Earth's crust is made up of these minerals, in fact, and they have numerous uses for humans, ranging from scouring solutions to glassware.

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  • Feldspar - Chemical composition | Britannica.com

    Feldspar - Chemical composition: All the rock-forming feldspars are aluminosilicate minerals with the general formula AT4O8 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.

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  • What is Feldspar? - Industrial Minerals Association ...

    Feldspar minerals are essential components in igneous, metamorphic and sedimentary rocks, to such an extent that the classification of a number of rocks is based upon feldspar content.

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  • K Feldspar: Mineral information, data and localities.

    Brown, W.L. and Parsons, I. (1984) The nature of potassium feldspar, exsolution microtextures and development of dislocations as a function of composition in perthitic alkali feldspars. Contributions to Mineralogy and Petrology: 86: 335-341.

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  • USGS Minerals Information: Feldspar

    In glassmaking, feldspar provides alumina for improving hardness, durability, and resistance to chemical corrosion. In ceramics, feldspar is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase.

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  • feldspar - Wiktionary

    feldspar (countable and uncountable, plural feldspars) Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.

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  • Feldspar mineral - digitalfire.com

    Mineral: Feldspar Notes. An indispensable material in the ceramic industry. Most ceramic bodies employ feldspar as a flux to vitrify them at a lower temperature (the feldspar creates a glaze that glues the more refractory particles together to form the fired matrix).

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  • Orthoclase Feldspar - Geology

    Orthoclase is the feldspar mineral of pink granite, the #6 mineral of the Mohs hardness scale, and one of the two minerals that comprise Moonstone.

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  • Orthoclase - Wikipedia

    Orthoclase, 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 "straight fracture," because its two cleavage planes are at right angles to each other.

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  • Division of Geology and Mineral Resources - Feldspar

    The feldspar provides alumina, which improves durability of the glass. The feldspar-rich rock is extracted using open pit methods, then crushed, classified and dried on-site. Heavy minerals are removed from the material by electrostatic and magnetic processes. The processed material is then transported by truck and rail to markets.

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  • Feldspar - Wikipedia

    Feldspars (K Al Si 3 O 8 – Na Al Si 3 O 8 – Ca Al 2 Si 2 O 8) are a group o rock-furmin tectosilicate meenerals that mak up as much as 60% o the Yird's crust.. Feldspars crystallize frae magma as veins in baith intrusive an extrusive igneous rocks an are an aa present in mony types o metamorphic rock. Rock furmed almaist entirely o calcic plagioclase feldspar is kent as anorthosite.

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  • Category:Feldspar - Wikimedia Commons

    Media in category "Feldspar" The following 85 files are in this category, out of 85 total.

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  • Gallery of Feldspars - ThoughtCo

    Gallery of Feldspars. Search. Search the site GO. Science. Geology Basics Types of Rocks Geologic Features Geologic Processes Plate Tectonics Chemistry Biology Physics ... so any glassy mineral that's softer than quartz and cannot be scratched with a knife is very likely to be a feldspar. Feldspars lie along one of two solid-solution series ...

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  • Geology - Feldspar

    Geology Spruce Pine, North Carolina, USA. ... In 1917 Spruce Pine, North Carolina became the primary feldspar producer in the U.S. and has continued to maintain that status ever since. Mica & Feldspar Applications. Registered office: 43 Quai de Grenelle, 75015 Paris, France .

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  • Gallery of Feldspars - ThoughtCo

    Gallery of Feldspars. Search. Search the site GO. Science. Geology Basics Types of Rocks Geologic Features Geologic Processes Plate Tectonics Chemistry Biology Physics ... so any glassy mineral that's softer than quartz and cannot be scratched with a knife is very likely to be a feldspar. Feldspars lie along one of two solid-solution series ...

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  • Geology - Feldspar

    Geology Spruce Pine, North Carolina, USA. ... In 1917 Spruce Pine, North Carolina became the primary feldspar producer in the U.S. and has continued to maintain that status ever since. Mica & Feldspar Applications. Registered office: 43 Quai de Grenelle, 75015 Paris, France .

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  • Feldspar | Article about feldspar by The Free Dictionary

    feldspar (fĕl`spär, fĕld`–) or felspar (fĕl`spär), an abundant group of rock-forming minerals which constitute 60% of the earth's crust.Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.

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  • K-Feldspar and Plagioclase Feldspar

    Feldspars have two cleavage planes that intersect at 90°. Fragments of pure feldspar crystals thus tend to form rectangular blocks with irregular ends. Feldspars have vitreous lusters and occur in opaque shades of white to gray to pink to very dark gray.

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  • Feldspar - USGS.gov

    Mar 23, 2017 · Primary Commodity: Feldspar Primary Commodity Uses : Feldspar is one of the most common minerals on the planet and is mostly used for glassmaking and ceramics. Details

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  • University of Minnesota’s Mineral Pages: Potassium Feldspar

    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.

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