Difference between revisions of "Gabbro"
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== Description == | == Description == | ||
| − | A coarse-grain igneous rock composed of plagioclase [ | + | A coarse-grain igneous rock composed of plagioclase [[feldspar]]. Gabbro primarily contains [[labradorite]], [[augite]], and [[pyroxene]]. It is sold commercially as a [[granite]] and is used as a building stone. Major commercial sources for gabbro occur in Scotland (Island of Skye), South Africa (Bushveld, Karroo), Canada (Sudbury in Ontario, Labrador), Greenland, and the U.S. (Minnesota, New Jersey, California, New York, Wyoming, Montana). Minnesota Black and Opalescent are brand names for some gabbros. |
[[File:gabbrolarge.jpg|thumb|Gabbro]] | [[File:gabbrolarge.jpg|thumb|Gabbro]] | ||
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
diabase; norite; trap rock; Minnesota Black; Opalescent; Gabbro (Deut.); gabro (Esp., Port.); gabbro (Fr.); gabbro (Ned.) | diabase; norite; trap rock; Minnesota Black; Opalescent; Gabbro (Deut.); gabro (Esp., Port.); gabbro (Fr.); gabbro (Ned.) | ||
| − | + | ==Physical and Chemical Properties== | |
| − | + | * Mohs Hardness = > 5.5 | |
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| − | == | + | == Resources and Citations == |
* ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | * ''Dictionary of Building Preservation'', Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 | ||
| − | * | + | * Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992 |
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "gabbro" | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "gabbro" [Accessed January 22, 2002] |
| − | * | + | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 |
| − | * Wikipedia | + | * Wikipedia: http://en.wikipedia.org/wiki/Gabbro (Accessed Nov. 2, 2005) |
| − | * | + | * Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997 |
* ''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 | ||
Latest revision as of 12:42, 22 August 2020
Description
A coarse-grain igneous rock composed of plagioclase Feldspar. Gabbro primarily contains Labradorite, Augite, and Pyroxene. It is sold commercially as a Granite and is used as a building stone. Major commercial sources for gabbro occur in Scotland (Island of Skye), South Africa (Bushveld, Karroo), Canada (Sudbury in Ontario, Labrador), Greenland, and the U.S. (Minnesota, New Jersey, California, New York, Wyoming, Montana). Minnesota Black and Opalescent are brand names for some gabbros.
Synonyms and Related Terms
diabase; norite; trap rock; Minnesota Black; Opalescent; Gabbro (Deut.); gabro (Esp., Port.); gabbro (Fr.); gabbro (Ned.)
Physical and Chemical Properties
- Mohs Hardness = > 5.5
Resources and Citations
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Encyclopedia Britannica, http://www.britannica.com Comment: "gabbro" [Accessed January 22, 2002]
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: http://en.wikipedia.org/wiki/Gabbro (Accessed Nov. 2, 2005)
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998