Feldspar

Potassium feldspar is a potassium rich silicate mineral. He has the advantages of low melting point, long melting interval, high melt viscosity and low fluidity. It is widely used in industrial sectors such as ceramic embryo materials, electric welding rods and so on.
Feldspar titanium oxide <0.02%, sagittal 0.54 hardness fluctuates at 6-6.5, brittle, has higher compressive strength, and has strong chemical stability to acids.
Uses; manufacture flat glass, alkali glass, glassware, ceramic oil, high voltage electric porcelain and so on.
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Feldspar is a general term for feldspar rocks. It is a type of aluminosilicate minerals containing calcium, sodium and potassium. It is the most common mineral in the earth's crust, with a ratio of 60%, which can be found in igneous rocks, metamorphic rocks and sedimentary rocks. Feldspar is the main mineral composition of almost all igneous rocks, and is of great significance for classification of rocks. Feldspar isomorphic substitution is very developed. Their chemical composition is commonly expressed as OrxAby Anz (x + y + Z = 100). Or, Ab and An represent KAlSi3O8, NaAlSi3O8 and CaAl2Si2O83 components respectively. Based on a two component, it can be divided into two isomorphic series: alkaline feldspar series (Or-Ab Series); plagioclase series (Ab-An Series). The mixture of Or and An can be miscible only and does not form a series.
The basic structural unit of feldspar is tetrahedron. It consists of 4 oxygen atoms surrounded by a silicon atom or aluminum atom. Each tetrahedron shares an oxygen atom with another tetrahedron, forming a three-dimensional skeleton. The large radius of alkali or alkaline earth metal cations is located in the large gap within the skeleton, and the coordination number is 8 (in the monoclinic feldspar) or 9 (in the three diagonal feldspar). Feldspar crystals are mostly columnar or columnar along a crystalline axis. Twinning is very common. There are more than 20 kinds of twin crystals. Common are sodium long stone law, the law of man's law, Bawinno's law, and the double crystal of Xiao Na Chang Shi law. They are found in three oblique crystals or monoclinic and three oblique crystals respectively. Feldspar is often milky white, but it is often dyed with yellow, brown, light red, dark grey and so on. Some can also have beautiful color change or color. There are two groups of cleavage, with an angle of 90 degrees (monoclinic) or near 90 degrees (87 degrees) (three diagonal system). The proportion between 2.56 and 2.76 increased with the increase of An content and decreased with the increase of Or. The moth hardness is 6 ~ 6.5. The feldspar rich in potassium or sodium is mainly used in the ceramic industry, the glass industry and the enamel industry. The feldspar containing rare elements such as rubidium and cesium can be used as a mineral material for the extraction of these elements, and the beautiful feldspar of color can be used as a decorative stone and a secondary gem.