emery
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
emery:
see corundumcorundum, mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in masses. It is transparent to opaque and has a vitreous to adamantine luster.
..... Click the link for more information. .
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Emery
fine-grained rock in which the corundum is closely interlocked with such minerals as magnetite, sulfides, and brittle mica. Containing up to 60 percent corundum, emery is one of the natural abrasive materials. Emery has a hardness of 7–8 on the mineralogical scale. It is found chiefly in marble in the form of lenses, stocks, nests, and veins. Less frequently emery occurs in the form of xenolith in gabbro, norite, and granite or at the contact between these rocks and enclosing rock.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
emery
[′em·ə·rē] (materials)
An abrasive which is composed of pulverized, impure corundum; used in polishing and grinding.
(mineralogy)
A fine, granular, gray-black, impure variety of corundum containing iron oxides, either hematite or magnetite; occurs as masses in limestone and as segregations in igneous rock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
emery
A granular form of impure carborundum; used for grinding and polishing glass, stone, and metal surfaces.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
emery
a. a hard greyish-black mineral consisting of corundum with either magnetite or haematite: used as an abrasive and polishing agent, esp as a coating on paper, cloth, etc. Formula: Al2O3
b. (as modifier): emery paper
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005