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Feldspars | Article about Feldspars 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 silica

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What kind of rock is feldspar

The feldspars are a group of silicate rock forming minerals, and therefore a mineral, not a rock.

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Feldspar: The Potter's Pet Rock - Ceramic Arts Network

Feldspars are minerals of varying composition commonly used by potters. Feldspars form a glassy, white surface when fired high enough. They have a very long range, they begin melting at cone 4 and continue fusing beyond cone 10.

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Potash Feldspar

Alternate names: K-Feldspar, Orthoclase, K Feldspar, Potassium Feldspar - Digitalfire Reference Database (no ads)

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What is feldspar used for - qa.answers.com

Go to an area nearby a formerly active volcano and you will find feldspar, because it is an igneous rock.

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QUARTZ AND FELDSPAR. - USGS

QUARTZ AND FELDSPAR. ... The commercially important feldspar and quartz deposits, of Maine all belong to a single type of rocks known to the geologist as pegma­

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Rock Types

Granite is a very common plutonic rock with feldspar and quartz as the main constituents. Granite is an igneous rock, ...

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Feldspar - Chemical composition |

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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University of Minnesota's Mineral Pages: Plagioclase Feldspar

The plagioclase feldspar subgroup consists ... especially those that formed from the alteration of shale or igneous rocks. Although plagioclase feldspars will ...

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Feldspar Stone Meaning - Crystal, Healing Properties ...

Properties - Feldspar crystallize from magma in both with intrusive and extrusive igneous rocks. It is also present in metamorphic and sedimentary types of rocks. Feldspar has been derived from a german word which means a rock that does not contains ore .It is made up of group forming tectosilicate minerals that almost covers 60% of the earth's ...

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Feldspar | Define Feldspar at

Feldspar definition, any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks.

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A Detailed Overview of Feldspar: Types, Properties, and …

The word feldspar is derived form the word 'Feldspat', of German origin.This word is used to represent a rock which doesn't bear any ore component.

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What kind of rock is feldspar

The feldspars are a group of silicate rock forming minerals, and therefore a mineral, not a rock.

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THE FELDSPAR GROUP OF MINERALS

The feldspar group is a fairly large group with nearly 20 members recognized, but only nine are well known and ... but are also present in many metamorphic rocks.

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Feldspar - the Gem and Mineral

The feldspar minerals are the most common on earth. These include some gemstones such as moonstone, sunstone and spectrolite.

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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, ...

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Felspar | Define Felspar at

German Fels rock + spar 3, ... For this purpose the proportions of the flint and the felspar must be increased. A Dictionary of Arts, Manufactures and Mines. Andrew Ure.

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Feldspar | Minerals Education Coalition

Hard-rock mining for feldspars is done by open-pit methods, either by the mine owner or by contractors. After the feldspar ore is drilled and blasted, ...

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Feldspar | Definition of Feldspar by Merriam-Webster

Feldspar definition is ... with either potassium, sodium, calcium, or barium and that are an essential constituent of nearly all crystalline rocks. ...

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Sandstones and Conglomerates - Tulane University

A feldspar-rich sandstone is ... Although feldspars are the most common minerals in igneous and metamorphic rocks, feldspars are less stable than quartz ...

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rock felspar

Olivine, Cordierite and Feldspar. Feldspars are very important rock-forming minerals and they are covered in more detail in other geology …

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Gemstones - Feldspar

Of all of the minerals in the Earth's crust, the aluminosilicate, feldspar, is the most common. It is a very useful industrial mineral that finds applications in making glass, plumbing fixtures, tile and pottery.

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Feldspar - definition of feldspar by The Free Dictionary

Define feldspar. feldspar synonyms, ... These grains were by far the most abundant and included quartz, feldspar, rock fragments, heavy minerals and micas.

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In the category of rocks, what does quartz, feldspar and ...

 · Naked Science Forum; Non Life Sciences; Geology, Palaeontology & Archaeology; In the category of rocks, what does quartz, feldspar and mica mean?

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Feldspar- Varieties,Formation,Sources,Properties,Test,Tips

Feldspars, the most important of the rock-forming minerals, are integral constituents of almost every igneous rock; in fact, it is the color of the feldspar that ...

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