Lexic.us

Definition of Corundum

1. Noun. Very hard mineral used as an abrasive.

Definition of Corundum

1. n. 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. It is the hardest substance found native, next to the diamond.

Definition of Corundum

1. Noun. (minerology) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive. ¹

¹ Source: wiktionary.com

Definition of Corundum

1. a hard mineral [n -S]

Medical Definition of Corundum

1. Native crystalline aluminum oxide. Origin: Hind. Kurand (05 Mar 2000)

Lexicographical Neighbors of Corundum

Literary usage of Corundum

Below you will find example usage of this term as found in modern and/or classical literature:

1. Bulletin by North Carolina Dept. of Conservation and Development, North Carolina Geological Survey (1883-1905), North Carolina Geological and Economic Survey (1907)
"corundum GEMS.' While diamonds and gold are found in the Piedmont country east of the mountains, North Carolina's chief corundum rocks are in Madison, ..."

2. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"A distinction is made between the transparent ' precious corundum ' and the dull, opaque ' common corundum,' while a third still less pure variety is known ..."

3. Economic Geology: With Special Reference to the United States by Heinrich Ries (1910)
"Attempts have been made to use it as a substitute for corundum in the manufacture of emery wheels, for, although softer, it possesses the advantage of ..."

4. Economic Geology: With Special Reference to the United States by Heinrich Ries (1910)
"A specific gravity of 4 helps to distinguish it from other light-colored minerals found in the corundum regions. corundum shows a variable behavior when ..."

5. The Mineral Industry (1902)
"The production of corundum and emery and the imports of emery in recent years ... Two noteworthy changes have been made in the corundum industry during 1! ..."

6. Mineral Deposits by Waldemar Lindgren (1913)
"corundum is, however, unquestionably also developed by the contact ... corundum may also be developed by the regional metamorphism of clay shale and shaly ..."

7. Proceedings of the American Association for the Advancement of Science (1852)
"The constant occurrence of corundum, emery, and^ its associates in the old ... From Liberia, corundum has been obtained, associated with tourmaline and ..."

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