Because of corundum's hardness, it can scratch almost every other mineral. ], The numerical value of corundum in Chaldean Numerology is: 1, The numerical value of corundum in Pythagorean Numerology is: 1. 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 … High-quality ruby and sapphire have always been among the most expensive gems … the earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. This can give a good indication as to the general availability of this gemstone in different sizes. It is commonly used as an abrasive, on everything from sandpaper to large machines used in machining metals, plastics, and wood. Because of corundum's hardness, it can scratch almost every other mineral. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. It is the hardest substance found native, next to the diamond. ko-run′dum, n. a mineral consisting of mere alumina, yet of great specific gravity—about four times that of water—and second in hardness only to the diamond. Kievlenko (2003) Geology of gems, p. 62, E.Ya. The name "corundum" is derived from the Tamil word kuruntam meaning "ruby", and related to Sanskrit kuruvinda. Click on a photo for more information. Near surface cracks are healed with wax or with silicate glass, during which the processable stone is immersed into a silicate melt or heated in conjuction with a powder-like filling material such as, borax or glass. Corundum is called Ruby if red and Padparadscha if pink-orange. In addition to its hardness, corundum is unusual for its density of 4.02 g/cm³, which is very high for a transparent mineral composed of the low atomic mass elements aluminium and oxygen. Corundum definition: a white, grey , blue , green, red, yellow, or brown mineral, found in metamorphosed... | Meaning, pronunciation, translations and examples Kievlenko (2003) Geology of gems, p. 70, Hpakant Township (Hpakan; Phakant; Phakan), Thabeikkyin Township (Tha Pate Kyin Township), Helena Mining District (Spring Hill Mining District). Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The other meanings are Karand and Aik Tarah Ka Mukhtalif Rangon Ka Neelam. Web. Tamil kuruntam; akin to Sanskrit kuruvinda ruby. Learn a new word every day. Dichroism: blue - violet-blue and greenish-blue; green - yellowish-green; yellow - pale yellow; purple - violet; orange, yellowish-red - deep crimson. An extremely hard mineral, a form of aluminum oxide with the chemical formula AlO, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive. All other colours are called Sapphire. [Hind. Test Your Knowledge - and learn some interesting things along the way. Britannica.com: Encyclopedia article about corundum. ‘First, to prove beryllium could diffuse into corundum and create a color change, he heated pink sapphires with beryllium and got yellow rims.’ Origin Early 18th century from Tamil … These are almost certainly not of Tamil origin, as they have been in English since Middle English, and except for Corundum as mentioned here is from kuruntam (Tamil). 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. Artificial healing of cracks and cavities and high-temperature thermal processing are used to increase the transparency and to improve the colour (Nassau, 1981).

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