quartz: the chemical formula SiO2, found in nature in the form of a hexagonal or triple cross-section prismatic crystals, cruelty 7, specific gravity of 2.65 for unimpaired acids except fluorine acid, dissolved in water at temperatures higher than 360, Atkahrb heating pyroelectrisation or pressure and tensile piezoelectrisation (so It is used to give a spark when the pressure in the thermal-invasive devices), net kind of it colorless and if impurities are placed in spaces and spatial structure of the retina canals acquire a variety of colors kit. Among the most famous types of senseless color and colored with beautiful colors that extracted precious gems: Quartsberistol bristol quartz (colorless) Krizoberaz cryzoprase (green Tvahi), quartz Bohemian bohemian quartz (red), Ovantoren avanturine (red gold) Ptolqat, tiger's eye or cat tiger's or cat's quartz (green or blue is shown a yellow colors of gold), eagle eye (Quartz exhale) sapphire quartz (blue is shown in colors), Omatst amthyst (purple), citrine citrine (yellow), black quartz black quartz. And milky quartz and smog and others. Quartz uses precious jewels on a large scale (especially colored), in the manufacture of watches, computers, glass, optical lenses, fiberglass and «Damat» dangling in precious chandeliers. 4. Sapphire red ruby and exhale sapphire (sapphire blue): two of the gems that are selected and treated starting from crystals so-called Balchorondaum corundum which aluminum oxide and form Al2O3 crystallized prismatic forms elongated or flat or double pyramid (three-section or triple double), cruelty high comes after diamonds directly (rank 9 MOS) scale, specific gravity 4, net types of Alchorondaum large crystallized form jewels rubies and exhale, while poor species used in grafting cutting, shearing tools and grinding and polishing and invests large rallies in the aluminum extraction
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