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Minerals

Feldspar is by far the most abundant group of minerals in the earth's crust, forming about 60% of terrestrial rocks. Most deposits offersodium feldsparas well aspotassiumfeldspar and mixed feldspars. Feldspars are primarily used in industrial applications for their alumina and alkali content.

Quartzis the second-most-abundant mineral in Earth's continental crust, after feldspar. Its crystal structure is a continuous framework of SiO4silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.

Potash Feldspars

Potash Feldspars
  • Potash Feldspars
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Feldspars are important ingredients in clay bodies and glazes. In both applications, their primary function is to supply Fluxes to the formulations, but they also provide additional alumina (Al2O3) and silica (SiO2). Feldspars are naturally occurring minerals and are generally classified as either potash (potassium) or soda (sodium) feldspars based upon the predominant alkali metal element (the Flux) that is present. The minerals commonly referred to as lithium feldspars are not true feldspars, but they are aluminosilicates like feldspars and contain the Fluxing element lithium, and are used for the same purposes as the feldspars.

Feldspars are used:

  • As fluxing agents in the production of ceramics, where they play a vital role in the firing of tiles, sanitaryware, tableware and glazes.
  • In glass-making, where they provide the aluminium that enhances the strength and transparency of hollow glass, flat glass, and glass wool.
  • As fillers in coatings, plasters, insulation etc
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