Difference between revisions of "Bauxite"
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== Description == | == Description == | ||
| − | A soft, aluminum-containing ore. Bauxite is an impure mineral that contains hydrous aluminum oxides and aluminum hydroxides. In 1821, the first commercial source of bauxite was a mine near Les Baux, France; since then deposits have been found worldwide. Bauxite ores are usually a mottled reddish brown but can also be white, gray, yellow, or red. They typically contain 30-75% [http://cameo.mfa.org/materials/fullrecord.asp?name=aluminum | + | A soft, aluminum-containing ore. Bauxite is an impure mineral that contains hydrous aluminum oxides and aluminum hydroxides. In 1821, the first commercial source of bauxite was a mine near Les Baux, France; since then deposits have been found worldwide. Bauxite ores are usually a mottled reddish brown but can also be white, gray, yellow, or red. They typically contain 30-75% [http://cameo.mfa.org/materials/fullrecord.asp?name=aluminum%20oxide aluminum oxide]. In antiquity, bauxite was used as an ornamental stone. Currently it is used as a source for metallic [http://cameo.mfa.org/materials/fullrecord.asp?name=aluminum aluminum] and as a filler in cement, rubber, plastic, and paints. Major deposits of bauxite are found in France, Italy, Greece, Suriname, Guyana, Ghana, Guinea, India, Brazil, Jamaica, Australia, and the U.S.(Arkansas). |
[[File:pg40334gibbsite.jpg|thumb|Gibbsite]] | [[File:pg40334gibbsite.jpg|thumb|Gibbsite]] | ||
| Line 33: | Line 33: | ||
== Authority == | == Authority == | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "bauxite" | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "bauxite" Encyclopædia Britannica [Accessed December 4, 2001] |
| − | * | + | * Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982 |
| − | * | + | * Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992 |
| − | * | + | * Thomas C. Jester (ed.), ''Twentieth-Century Building Materials'', McGraw-Hill Companies, Washington DC, 1995 |
| − | * | + | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 |
* Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Bauxite (accessed Sept 2. 2005) | * Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Bauxite (accessed Sept 2. 2005) | ||
| − | * | + | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 |
| − | * | + | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 87 |
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
Revision as of 06:40, 24 July 2013
Description
A soft, aluminum-containing ore. Bauxite is an impure mineral that contains hydrous aluminum oxides and aluminum hydroxides. In 1821, the first commercial source of bauxite was a mine near Les Baux, France; since then deposits have been found worldwide. Bauxite ores are usually a mottled reddish brown but can also be white, gray, yellow, or red. They typically contain 30-75% aluminum oxide. In antiquity, bauxite was used as an ornamental stone. Currently it is used as a source for metallic aluminum and as a filler in cement, rubber, plastic, and paints. Major deposits of bauxite are found in France, Italy, Greece, Suriname, Guyana, Ghana, Guinea, India, Brazil, Jamaica, Australia, and the U.S.(Arkansas).
Synonyms and Related Terms
gibbsite [Al(OH)3]; boehmite [AlO(OH)]; diaspore [HAlO2]; Bauxit (Deut.); bauxita (Esp.); bauxite (Fr., Port.); bauxiet (Ned.); bauksitt (Nor.); boksyt (Pol.); bauxit (Sven.)
Other Properties
Decomposes in acids. Insoluble in water. No cleavage.
Fracture = earthy. Streak = white. Luster = dull.
| Mohs Hardness | 1 - 3 |
|---|---|
| Density | 2.4-2.6 |
Additional Images
Bauxite
Authority
- Encyclopedia Britannica, http://www.britannica.com Comment: "bauxite" Encyclopædia Britannica [Accessed December 4, 2001]
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Thomas C. Jester (ed.), Twentieth-Century Building Materials, McGraw-Hill Companies, Washington DC, 1995
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Bauxite (accessed Sept 2. 2005)
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 87
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998