Corundum - Wikipedia
Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium. [ 3 ][ 4 ] It is a rock -forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [ 7 ] .
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system.
The Mineral corundum - The Mineral and Gemstone Kingdom
Corundum is a very hard, tough, and stable mineral. For all practical purposes, it is the hardest mineral after Diamond, making it the second hardest mineral. It is also unaffected by acid s and most environments. Translucent brown Corundum …
Geology of Corundum and Emerald Gem Deposits: A Review
2020年1月31日 · The main corundum-bearing ore is composed of three main rock types (figure 7): sapphirine-gedrite, leucogabbro, and a phlogopitite, which is the most important. The leucogabbro contains a large amount of pink corundum.
Corundum | Properties, Formation, Uses » Geology Science
2024年7月1日 · Corundum is a mineral that is primarily composed of aluminum oxide (Al2O3) and is one of the naturally occurring crystalline forms of aluminum oxide. It is a very hard mineral and is commonly used as an abrasive in various industrial applications.
Corundum Value, Price, and Jewelry Information - International …
The corundum family of gemstones consists of ruby and sapphire. Corundum is very compact, dense, and lacks gemstone cleavage. It’s also the second hardest natural mineral after diamond. Gem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry stones.
Corundum Gemstone: Properties, Meanings, Value & More - Gem Rock …
2022年10月3日 · The corundum sapphire is the state gemstone of Montana, USA, and Queensland, Australia. Blue sapphire is Sri Lanka’s national stone, while Myanmar and Thailand honor the corundum ruby as their national stone. This guide covers all the meanings, prices, history, and properties of corundum gemstones. About Corundum Stone.
Corundum | Aluminum Oxide, Gemstone, Abrasive | Britannica
2024年10月15日 · Corundum, naturally occurring aluminum oxide mineral (Al2O3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones sapphire and ruby (qq.v.), and its mixtures with iron oxides and other minerals are called emery (q.v.).
Corundum: Mineral information, data and localities. - mindat.org
Formula: Al2O3. As a Commodity: Alumina. Colour: Colourless, blue, red, pink, yellow, grey, golden-brown. Lustre: Adamantine, Vitreous, Pearly. Hardness: 9. Specific Gravity: 3.98 - 4.1. Crystal System: Trigonal. Member of: Hematite Group. Name: Named "corinvindum" in 1725 by John Woodward and derived from the Sanskrit, kuruvinda ("Ruby").
Corundum - Minerals Education Coalition
Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present.