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what kinds of mining is used for corundum

Corundum is a crystalline form of aluminum oxide Al2O3 with traces of iron titanium and chromium It is a rockforming mineral It is one of the naturally transparent materials but can have different colors when impurities are present Transparent specimens are used as gems such as sapphires and rubies

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    Corundum and other minerals such as mica and kaolin were hauled to the railroad by horse and wagon and shipped out of Macon County in large quantities Equipment Mining Of Corondum Crusherasia Corundum Mining in TanzaniaCorundum Mining EquipmentCorundum Corundum is crystalline aluminum oxide Al2O3 second hardest on Mohs Scale and

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    Mining Part 2 Important Minerals Gems and Rocks Mined

    Corundum A form of aluminum oxide second only to the diamond in hardness found in Madison County in 1846 Mining began in 1871 in Macon County where corundum soon found greater application as an abrasive than a gemstone By 1895 nearly all of the corundum produced and used in the United States came from the counties west of the Blue Ridge

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    Corundum in its pure state is colourless but the presence of small amounts of impurities can impart a broad range of hues to the mineral Ruby owes its red colour to chromium sapphire its blue shades to the presence of iron and titanium most corundum contains nearly 1 percent iron oxide The mineral readily weathers to other aluminous mineralseg margarite zoisite sillimanite and

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    Ruby Sapphire – These precious gemstones are the same mineral corundum When found as red corundum it is called ruby Every other color including blue is called sapphire It is the hardest mineral on Earth second to diamond Ruby is the birthstone for July and Sapphire is

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    The Most Important Uses of the Mineral Sapphire Synonym

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    Corundum A form of aluminum oxide second only to the diamond in hardness found in Madison County in 1846 Mining began in 1871 in Macon County where corundum soon found greater application as an abrasive than a gemstone By 1895 nearly all of the corundum produced and used in the United States came from the counties west of the Blue Ridge

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    Corundum has been found plentifully in Eastern Ontario usually in nephelinesyenite and at one time considerable quantities were mined for the manufacture of corundum wheels and other grinding instruments Being close to diamond in hardness corundum is a first rate abrasive that is a material suitable for grinding and polishing

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    4 CORUNDUM DEPOSITS OF MONTANA duction was valued at 20000 to 50000 during the period 193643 but periods of inactivity preceded and followed those years Synthetic corundum has now largely displaced natural sapphire for industrial use About 350 tons of corundumbearing rock was produced from the

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    Mar 08 2016 · Synthetic rubies are primarily of three types doublets Verneuil or flame fusion and flux grown Doublets This type of synthetic rubies are not much in vogue nowadays However they make great gifts Doublets are usually stones of imitation backing with a natural corundum crown generally made out of green or white corundum

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