 |
corundum
Found in thesaurus: mineral
| Babylon English | Download this dictionary |
corundum
n.
chemical substance which contains aluminum oxide
| English Wikipedia - The Free Encyclopedia | Download this dictionary |
Corundum
Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium 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. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen.
| See more at Wikipedia.org... |
© This article uses material from Wikipedia® and is licensed under the GNU Free Documentation License and under the Creative Commons Attribution-ShareAlike License
| WordNet 2.0 | Download this dictionary |
corundum
Noun
1. very hard mineral used as an abrasive
(synonym) corundom
(hypernym) mineral
(hyponym) alumina, aluminum oxide, aluminium oxide
(substance-holonym) emery
| Webster's Revised Unabridged Dictionary (1913) | Download this dictionary |
Corundum
(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.
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.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
| Mineralogy Database | Download this dictionary |
Corundum
General Information:
Al2O3
(Molecular Weight = 101.96 gm)
Aluminum 52.93 % Al
Oxygen 47.07 % O
(Al2O3)
Contact and regionally metamorphosed rocks.
Tchainit and Yakutia, Russia.
Probably derived from the Sanskrit, kuruvinda, meaning "ruby."
Physical Properties:
None
blue, red, yellow, brown, or gray.
4 - 4.1, Average = 4.05
Transparent to translucent
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms ( e.g. tourmaline).
9 - Corundum
None.
Vitreous (Glassy)
none
More details...
