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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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Feldspars - all about the plagioclases and K-feldspars

Aug 11, 2018 · Feldspars are mostly used in ceramics industry. Gem quality clear feldspars, moonstone and labradorite are used in jewelry. Labradorite rich rocks or amazonite granites are also used as decorative building stones. Structure and composition of feldspars. Feldspars belong to the tectosilicates, sometimes referred also as network silicates.

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Feldspar mineral family - Gemstone's Information

Feldspar gets its name from the German word "Feldspath" and related to the German word for rock. Feldspar, sometimes written as felspar, is the name for a group of silicate minerals that makes up the .

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feldspar - definition - English

[noun] 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 .

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Feldspar Gemstones and Minerals | Gem5

Microcline: Microcline is a silicate of potassium and aluminum, and an alkali member of the feldspar group.It is the phase of this compound that is stable at low temperature. The feldspars are major constituents of the rocks on the earth's crust and comprise some of .

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The Magic of Rocks and Stones - Moonstone

The most common Moonstone in the Feldspar family is that of the mineral Adularia, but many famous and rarer specimens are from the Plagioclase Feldspars of Albite (Sodium Aluminum Silicate), along with the Oligoclase and Labradorite varieties.

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Alkali Feldspar | Encyclopedia

alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium. The normal feldspar minerals (including the calcium-bearing varieties) can be plotted on a chemical basis into a triangle which has KAlSi 3 O 8 (potassium feldspar, sanidine, orthoclase (Or), or microcline), NaAlSi 3 O 8 (sodium feldspar, albite, or Ab), and CaAl 2 Si 2 O 8 (calcium ...

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

What is Feldspar? "Feldspar" is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth's crust. [1] They are found in igneous, metamorphic, and sedimentary rocks in all parts of the world. Feldspar minerals have very similar structures, .

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Feldspar Gemstone Info - GemSelect

Jul 06, 2008 · Amazonite, moonstone and orthoclase are all potassium feldspars. They have a hardness of 6 to 6.5 on the Mohs scale and a vitreous luster. Moonstone also exhibits a unique shimmer known as adularescence.. Labradorite, andesine and sunstone are plagioclases feldspars.

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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 of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.. Feldspars crystallize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as ...

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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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Moonstone | Housekihime Wiki | Fandom

Moonstone is the birthstone of June and is the Florida State Gemstone since 1970 to commemorate the Moon landings. Moonstone represents longevity, wealth, tranquility and femininity. Moonstone is the most well-known gemstone variety of orthoclase feldspar, a potassium aluminum silicate.

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GEMSTONE ARTICLE: Feldspar

Apr 08, 2007 · Studying Feldspar crystals and gemstones is a fascinating journey. This simple Aluminum Silicate can range in appearance from a dirty, clay like material to gorgeous eye dazzling gemstone like Rainbow Moonstone and Labradorite. For many centuries this mineral that covers 60% of Mother Earth's crust was greatly under appreciated as a crystal family.

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Moonstone - Crystal Meanings - Spirit Of ISIS Crystals

Moonstone describes any variety of Feldspar with the 'moonstone' sheen. Feldspars are a group of minerals that have similar structures and are complex in groupings and mineral composition. Moonstone is a variety name for Adularia, a potassium aluminium silicate Orthoclase Feldspar, and also Sanidine.

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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. It is a type of potassium feldspar, also known as K-feldspar.The gem known as moonstone (see below) is largely composed of orthoclase.

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Moonstone - Crystal Meanings - Spirit Of ISIS Crystals

Moonstone describes any variety of Feldspar with the 'moonstone' sheen. Feldspars are a group of minerals that have similar structures and are complex in groupings and mineral composition. Moonstone is a variety name for Adularia, a potassium aluminium silicate Orthoclase Feldspar, and also Sanidine.

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Moonstone - feldspar - adularescence - blue sheen ...

Moonstone. Buy natural moonstone in our shop. Moonstone is a sodium potassium aluminium silicate with the chemical formula (Na,K)AlSi3O8 and belongs to the feldspar group. Its name comes from a visual effect, or sheen, due to the light diffraction within a micro-structure consisting of a regular of feldspar layers (lamellae).

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Kids.Net.Au - Encyclopedia > Feldspar

A soda microcline named anorthoclase is known, which is an isomorphous mixture of KAlSi 3 O 8 and NaAlSi 3 O 8, the sodium-aluminium silicate being in larger proportion. The sodium feldspar albite (NaAlSi 3 O 8 ) and the calcium feldspar anorthite (CaAl 2 Si 2 O 8 ) form an isomorphous series from pure albite at one end and pure anthorite at ...

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feldspar - definition, etymology and usage, examples and ...

n feldspar In mineralogy, one of a very common group of closely related minerals, all silicates of aluminium, together with either calcium, sodium, potassium, or in one case barium. They crystallize in the monoclinic or triclinic system with closely similar angles. The prismatic angle is not far from 120°, and they have two easy cleavages which make an angle of 90°, or nearly 90°, with each ...

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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.

Get Price

Feldspars - all about the plagioclases and K-feldspars

Aug 11, 2018 · Feldspars are mostly used in ceramics industry. Gem quality clear feldspars, moonstone and labradorite are used in jewelry. Labradorite rich rocks or amazonite granites are also used as decorative building stones. Structure and composition of feldspars. Feldspars belong to the tectosilicates, sometimes referred also as network silicates.

Get Price