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Feldspar
Feldspar

Feldspar

Feldspar

A species of Minerals

Feldspars (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) 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 anorthosite. Feldspars are also found in many types of sedimentary rocks.

Density
Density:

2.56 g/cm³

General Info About Feldspar

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Physical Properties of Feldspar

Colors
Colourless, yellow, green, blue-green, orange, red-brown, dark gray, gray-black
Streak
White
Density
2.56 g/cm³, Normal Weight
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Chemical Properties of Feldspar

Formula
KAlSi3O8–NaAlSi3O8–CaAl2Si2O8

Characteristics of Feldspar

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Composition of Feldspar

The structure of a feldspar crystal is based on aluminosilicate tetrahedra. Each tetrahedron consists of an aluminium or silicon ion surrounded by four oxygen ions. Each oxygen ion, in turn, is shared by a neighbouring tetrahedron to form a three-dimensional network. The structure can be visualized as long chains of aluminosilicate tetrahedra, sometimes described as crankshaft chains because their shape is kinked. Each crankshaft chain links to neighbouring crankshaft chains to form a three-dimensional network of fused four-member rings. The structure is open enough for cations (typically sodium, potassium, or calcium) to fit into the structure and provide charge balance.

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