• Corundum - Wikipedia

    en.wikipedia.org/wiki/Corundum Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral.It is also a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties: ruby and sapphire.
  • Corundum: Use as a Gemstone, Abrasive, Refractory

    geology.com/minerals/corundum.shtml Corundum is used as a gemstone, abrasive, refractory and much more. Red corundum is a ruby, blue is a sapphire, any other color is a fancy sapphire. Synthetic corundum is used instead of natural corundum in most applications.
  • Corundum | Definition of Corundum by Merriam-Webster

    www.merriam-webster.com/dictionary/corundum Corundum definition is - a very hard mineral that consists of aluminum oxide occurring in massive and crystalline forms, that can be synthesized, and that is used for gemstones (such as ruby and sapphire) and as an abrasive.
  • Corundum | Definition of Corundum at Dictionary.com

    www.dictionary.com/browse/corundum Corundum definition, a common mineral, aluminum oxide, Al2O3, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically. See more.
  • Corundum - definition of corundum by The Free Dictionary

    www.thefreedictionary.com/corundum co·run·dum (kə-rŭn′dəm) n. An extremely hard mineral, aluminum oxide, Al2O3, sometimes containing iron, magnesia, or silica, that occurs in gem varieties such as ruby and sapphire and in a common black, brown, or blue form used chiefly in abrasives. [Tamil kuruntam.] corundum (kəˈrʌndəm) n (Minerals) a white, grey, blue, green, red, yellow ...
  • Corundum: The mineral Corundum, Sapphire, Ruby info & pictures

    www.minerals.net/mineral/corundum.aspx Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue.
  • Corundum Value, Price, and Jewelry Information

    www.gemsociety.org/article/corundum-jewelry-gemstone-information 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.
  • GIA Gem Project Corundum

    www.gia.edu/gia-gem-corundum Ruby and sapphire (usually blue, but also in every other color) have been the most important colored gemstones for several thousand years. Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and durability.
  • CORUNDUM (Aluminum Oxide) - Amethyst Galleries

    www.galleries.com/Corundum When someone lists the most famous gemstones such as diamond, topaz, aquamarine, emerald and garnet, corundum does not usually get mentioned.However, its two varieties are sure to be on any list of gemstones. The red variety of corundum is known as ruby and all the other colors of corundum are known as sapphire.The rare colorless or white crystals are called corundum in the mineral world, but ...
  • Corundum: Mineral information, data and localities.

    www.mindat.org/min-1136.html Named "corinvindum" in 1725 by John Woodward and derived from the Sanskrit, kuruvinda ("Ruby"). Richard Kirwan used the current spelling "corundum" in 1794.