Difference between revisions of "Spessartine"
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[[[SliderGallery rightalign|spessartineRS.jpg~Raman]]] | [[[SliderGallery rightalign|spessartineRS.jpg~Raman]]] | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Fracture = conchoidal. Luster = vitreous to resinous. Streak = colorless. | + | * Fracture = conchoidal. |
| + | * Luster = vitreous to resinous. | ||
| + | * Streak = colorless. | ||
{| class="wikitable" | {| class="wikitable" | ||
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! scope="row"| Density | ! scope="row"| Density | ||
| − | | 4.15 | + | | 4.15 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| 1.800-1.810 | | 1.800-1.810 | ||
|} | |} | ||
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== Comparisons == | == Comparisons == | ||
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[[media:download_file_452.pdf|Properties of Common Gemstones]] | [[media:download_file_452.pdf|Properties of Common Gemstones]] | ||
| + | ==Resources and Citations== | ||
| + | * Jack Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982. | ||
| − | + | * Mineralogy Database: [http://www.webmineral.com/data/Spessartine.shtml Spessartine] | |
| − | |||
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 354 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 354 | ||
| − | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "spessartine." Accessed 20 Sept. 2005 . | |
| − | |||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "spessartine." | ||
* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | ||
Revision as of 15:01, 2 June 2022
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.)
Physical and Chemical Properties
- Fracture = conchoidal.
- Luster = vitreous to resinous.
- Streak = colorless.
| Composition | 3MnO-Al2O3-3SiO2 |
|---|---|
| Mohs Hardness | 7.0 - 7.5 |
| Density | 4.15 g/ml |
| Refractive Index | 1.800-1.810 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Jack Ogden, Jewelry of the Ancient World, Rizzoli International Publications, New York, 1982.
- Mineralogy Database: Spessartine
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 354
- Encyclopedia Britannica, http://www.britannica.com Comment: "spessartine." Accessed 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