| corundum |
corundom: very hard mineral used as an abrasive
출처: wordnet.princeton.edu/perl/webwn
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| corundum |
That extremely hard mineral from which emery is made.
출처: www12.mawebcenters.com/coltslaboratories/gloss.ivn...
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| corundum |
a hard form of alumina; used as the grit for sandpaper.
출처: www.tc.umn.edu/~puk/mn/glossary.html
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| corundum smelter's l. |
bauxite pneumoconiosis.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| corundum |
Corundum (aluminum oxide Al 2 O 3 ) is the hardest mineral other than diamond, though only 1/140 as hard. Red corundum is ruby, other colors are called sapphires. There is no clear demarcation of color to define which gems are called rubies or sapphires. Light red, pink or violet corundums are usually classified as sapphires with the name ruby reserved for truly red stones. The coloring in ruby comes from chrome, pigment in blue sapphire is iron and titanium, and in violet stones, vanadium. ...
출처: beadbear.com/glossary2cd.shtml
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