Spessartine: Difference between revisions
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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" | ||
| Line 23: | Line 25: | ||
|- | |- | ||
! 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 | ||
|} | |} | ||
== 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 17:01, 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