Emery - gem, from the standpoint of the jeweler.The chemist also say that it is only alumina, color infused inclusions of iron, chromium, vanadium, titanium and others. The impurities, which in percentage terms is around 2%, replace aluminum in the crystal lattice of the mineral.Surprisingly, the same atoms / ions in different minerals may behave differently.For example, chromium imparts red corundum, beryl (family composition) - green and green chrysoberyl morning and in the evening red (Alexander).Such is the chameleon.
Emery transparent intensely colored in the jewelry world has its own name.Red minerals known as rubies, green - both hlorosapfiry, blue - sapphire, colorless - like sapphire.In the old stones were called Bengal purple amethyst, purple - violet, red and violet - almandine sapphires.Transparent corundum stone orange, called padparadzha and yellow-pink - Padparadsha.
In the old days in the names of various embodiments of this mineral jewelers and traders used the word "East", which was to emphasize the quality of the stones.Oriental diamonds, oriental emeralds, aquamarines eastern, oriental topaz and eastern chrysolites - all corundum respective colors.Well, now that these names are not used, otherwise it would have been a mess.
Occasionally found corundum stone with the effect of asterism.In such instances it can be seen right six- or dvenadtsatiluchevaya star, whose rays by turning the stone moves over its surface.Rubies and star sapphires are very much appreciated.
Emery - rock hard (Mohs - 9).His superior in hardness only to diamond.Because of this non-gemstones are used as abrasives (for cutting and polishing of metal, glass).By the way, the word "abrasive" is synonymous with corundum.This mineral in demand and as a refractory material.
now launched production of artificial corundum.They are obtained by melting of bauxite with iron filings (as reducing agent) in electric furnaces.Most of them are used in engineering, in jewelry are just some of the stones.For example, synthetic rubies are used in the watch industry as the supporting stones, sapphire - in electronic industry.
Corundum is mined mainly in India, Burma, Madagascar, Thailand, Sri Lanka.Russia also have their deposits (in Krasnoyarsk, Primorye, the Chelyabinsk region in the Urals).
Emery - stone has long been recognized lithotherapists.And they use it depending on the color.It is believed that blue stones ocular pressure is normalized.Red - to improve blood flow, activate activity of glands, balance the metabolism.Purple - facilitate various neuralgia and mental disorders.Orange - rejuvenate, improve digestion.
corundum (stone) as a mascot is perfect for psychologists, doctors, teachers, as well as all women, celebrated its 40th anniversary.
