Spessartine: Difference between revisions
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A [[garnet|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 [[gemstone|gemstones]] are rare but a few have been found dating to the 2nd and 3rd century BCE (Odgen 1982). | A [[garnet|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 [[gemstone|gemstones]] are rare but a few have been found dating to the 2nd and 3rd century BCE (Odgen 1982). | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
garnet; spessartite; espesartina (Esp;); Spessartin (Deut.); spessartien (Ned.) | garnet; spessartite; espesartina (Esp;); Spessartin (Deut.); spessartien (Ned.) | ||
[[[SliderGallery rightalign|Spessartine Raman RRUFF R050063.png~IR-ATR (RRUFF)|Spessartine IR-ATR RRUFF R050063.png~Raman (RRUFF)|spessartineRS.jpg~Raman (RASMIN)]]] | |||
[[[SliderGallery rightalign|spessartineRS.jpg~Raman]]] | |||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
* Fracture = conchoidal | * Fracture = conchoidal | ||
* Luster = vitreous to resinous | * Luster = vitreous to resinous | ||
* Streak = colorless | * Streak = colorless | ||
* Fluorescence = inert | |||
* Birefringence = none | |||
{| class="wikitable" | {| class="wikitable" | ||
| Line 29: | Line 28: | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| 1.800-1.810 | | 1.800-1.810 | ||
|- | |||
! scope="row"| Dispersion | |||
| 0.0 (fire not visible) | |||
|} | |} | ||
Revision as of 15:37, 10 December 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
- Fluorescence = inert
- Birefringence = none
| Composition | 3MnO-Al2O3-3SiO2 |
|---|---|
| Mohs Hardness | 7.0 - 7.5 |
| Density | 4.15 g/ml |
| Refractive Index | 1.800-1.810 |
| Dispersion | 0.0 (fire not visible) |
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