Quartz, widely distributed mineral of many varieties that consists primarily of silica, or silicon dioxide (SiO2). Minor impurities such as lithium, sodium, potassium, and titanium may be present. Quartz has attracted attention from the earliest times; water-clear crystals were known to the ancient Greeks as krystallos, hence the name crystal, or more commonly rock crystal, applied to this variety. The name quartz is an old German word of uncertain origin first used by Georgius Agricola in 1530.
1- As a sandpaper abrasive and in sandblasting.
2- For polishing and cutting glass, stone, and metal.
3- For providing traction on stairs, streets, and rails.
4- In refractory, such as insulation and firebricks, foundry molds, and electrical insulators.
5- As an ingredient for glass and porcelain manufacture.
6- Is fused to make premium grades of chemical and optical glass .
7- For precision instruments, such as balances, galvanometers, and gravimeters.
8- As raw materials for processes in which silica is not the final product. These include the production of water glass, or sodium silicate.
9- very fine dispersions of solids in liquids, that are used as hydrophobic (water-repelling) coatings, organic silicates and silicones, silicon carbide, silicon metal, smelting flux, and alloying in metallurgy.
10- As semiprecious gems, ornamental stones, and collector’s items.
- Low thermal expansion.
- Low solubility.
- Transparency to various kinds of light.
- Density: 2, 65 g/ml.
- PH-Value: 7-9.
- Moh hardness: 7.
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