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Corundum is a relatively common mineral that once found wide application as an industrial abrasive. Gem corundum is mined almost exclusively from gem gravel deposits. These deposits are derived from the weathering of high temperature metamorphic (marble, gneiss) or igneous (volcanic or pegmatitic) source terrains.
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www.geo.utexas.edu/courses/347k/redesign/gem_notes/coru...
www.geo.utexas.edu/courses/347k/redesign/gem_notes/corundum/corundum_main.htm
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Corundum is very rarely mined from primary deposits, but typically mined from secondary alluvial or placer deposits, where this resistant mineral becomes the sand and gravel of stream beds. Ruby and sapphire have been synthesized since the end of the 19th century for industrial and gem quality uses.
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www.emporia.edu/earthsci/amber/go340/corundum.htm
www.emporia.edu/earthsci/amber/go340/corundum.htm
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Information on the mineral corundum ... The industrial term "emery" describing Corundum abrasives is derived from the variety Emery which is mined for abrasive use. Erosion may cause Emery to crumble and form sand, called "black sands". Corundum is easily synthesized, and many Corundum abrasives are synthetic.
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www.minerals.net/mineral/oxides/corundum/corundum.htm
www.minerals.net/mineral/oxides/corundum/corundum.htm
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Corundum (aluminum oxide) is one of the hardest minerals. Some colours of corundum have different names. Red corundum is called ruby, and quality corundum of other colours is Corundum is mined in various places, including Burma, Greece, and Sri Lanka. Quality corundum is considered a gemstone. [LM] {CC} {SS}
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www.alientravelguide.com/science/chemistr/inorgani/comp...
www.alientravelguide.com/science/chemistr/inorgani/compound/simpoxid/corundum.htm
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Low-grade ruby has been mined for an indefinite period, but India did not enter the major leagues of gem corundum production until the 1880s, with the discovery of sapphire in Kashmir. It is to these mines that we now turn...
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www.ruby-sapphire.com/r-s-bk-india.htm
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Unlike it's more familiar gem members, corundum and diamond, little myth or romance has attached itself to this stone. Though it was named and known ... The quantity of green stones which were mined in the early days of the Portuguese colonization and sent to Portugal mistakenly as Emerald will probably never be known.
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Ruby spheres at mineralminers.com: your on-line link direct to the mines and lapidary shops for mineral spheres that were handground and polished from natural color ruby crystals (red corundum) mined in India. ... Ruby Spheres; (natural red corundum) ... Location: from a natural ruby rough mined in India; Price: $161.31 ;
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www.mineralminers.com/html/rbysphs.stm
www.mineralminers.com/html/rbysphs.stm
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Polishes and refines with perfectly sized naturally mined Corundum Crystals and added antioxidants. ... Ingredients: Alumina (corundum crystal), water, caprylic/capric triglyceride, ethylhexyl palmitate, cetearyl alcohol, carthamus tinctorius (safflower) seed oil, wine extract, bacopa monniera extract,
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www.aveyou.com/dermanewfacialrejuvenationsystem5piece.a...
www.aveyou.com/dermanewfacialrejuvenationsystem5piece.aspx
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