Difference between revisions of "Spessartine"
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== Additional Information == | == Additional Information == | ||
| − | J. Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982. Mineralogy Database: [http://www.webmineral.com/data/Spessartine.shtml Spessartine] | + | ° J. Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982.° Mineralogy Database: [http://www.webmineral.com/data/Spessartine.shtml Spessartine] |
== Comparisons == | == Comparisons == | ||
| Line 41: | Line 41: | ||
== Authority == | == Authority == | ||
| − | * | + | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 354 |
| − | * | + | * Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982 |
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "spessartine." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "spessartine." Encyclopædia Britannica. 20 Sept. 2005 . |
| − | * | + | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 |
| − | * | + | * 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 | ||
Revision as of 06:42, 24 July 2013
Description
A garnet composed of manganese aluminum silicate. The color of spessartine may range from an orange-yellow to brownish-red. Gem quality stones are mined in Germany, Malagasy Republic, India, and the United States (Colorado and Maine). Historically, spessartine gemstones are rare but a few have been found dating to the 2nd and 3rd century BCE (Odgen 1982).
Synonyms and Related Terms
garnet; spessartite; espesartina (Esp;); Spessartin (Deut.); spessartien (Ned.)
Other Properties
Fracture = conchoidal. Luster = vitreous to resinous. Streak = colorless.
| Composition | 3MnO-Al2O3-3SiO2 |
|---|---|
| Mohs Hardness | 7.0 - 7.5 |
| Density | 4.15 |
| Refractive Index | 1.800-1.810 |
Additional Information
° J. Ogden, Jewelry of the Ancient World, Rizzoli International Publications, New York, 1982.° Mineralogy Database: Spessartine
Comparisons
Properties of Common Gemstones
Authority
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 354
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- Encyclopedia Britannica, http://www.britannica.com Comment: "spessartine." Encyclopædia Britannica. 20 Sept. 2005 .
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- 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