Quartz is the second-most-abundant mineral in Earth's continental crust, after feldspar. Its crystal structure is a continuous framework of SiO4 silicon- oxygentetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent, and has often been used for hardstone carvings, such as theLothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others.
USES OF QUARTZ
GLASSES Quartz sand is the major ingredient in virtually all types of glass. The principal glass products include containers (bottles and jars), flat glass (windows, mirrors), lighting glass (light bulbs, flourescent tubes), TV tubes and screens, decorative glass, fiberglass.
FOUNDRY CASTING Quartz sand is used for the preparation of: the form blends from cast-iron, steels and nonferrous foundires, abrasive cleaning of castings surfaces, as raw material for obtaining peliculizat sand.
FILTRATION Being the principal filtration environment in the water industry the silica sand is used-up in water filtration stations, water wells or to prevent crumbling.
CERAMICS Quartz sand that has been ground to fine size is an ingredient of most clay bodies and is a major constituent of ceramic glazes. Typical everyday products include tableware, sanitary ware, ornaments and wall and floor tiles.
CONSTRUCTION INDUSTRY The construction industry is founded on quartz sand and there are a host of specialist applications including silica and aerated concrete blocks, floor and roof tiles, flooring and rendering compounds, white markings, roofing felt and cement.
OTHER USE Silica has many other applications including the manufacture of chemicals and metals, fillers in numerous products, plastic, the manufacture of refractories, stimulating oil production.
SPECIFICATION OF QUARTZ
1) Loss on Ignition : 0.1% 2) Silica as Sio2 : 99.4% 3) Mixed oxides as R2O3 : 0.4% 4) Iron as Fe2O3 : 0.2% 5) Aluminium as Al2O3 : 0.2% (By diff) 6) Calcium as CaO : Traces.