Difference between revisions of "Spessartine"
Jump to navigation
Jump to search
| Line 8: | Line 8: | ||
[[[SliderGallery rightalign|Spessartine IR-ATR RRUFF R050063.png~IR-ATR (RRUFF)|Spessartine Raman RRUFF R050063.png~Raman (RRUFF)|spessartineRS.jpg~Raman (RASMIN)]]] | [[[SliderGallery rightalign|Spessartine IR-ATR RRUFF R050063.png~IR-ATR (RRUFF)|Spessartine Raman RRUFF R050063.png~Raman (RRUFF)|spessartineRS.jpg~Raman (RASMIN)]]] | ||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | + | * Isometric crystal system with massive to crystalline habit | |
| + | * Cleavage = none | ||
* Fracture = conchoidal | * Fracture = conchoidal | ||
* Luster = vitreous to resinous | * Luster = vitreous to resinous | ||
| − | * Streak = colorless | + | * Streak = colorless to white |
* Fluorescence = inert | * Fluorescence = inert | ||
* Birefringence = none | * Birefringence = none | ||
| Line 21: | Line 22: | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | | + | | 6.5 - 7.5 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| Line 30: | Line 31: | ||
|- | |- | ||
! scope="row"| Dispersion | ! scope="row"| Dispersion | ||
| − | | 0. | + | | 0.027 (weak fire) |
|} | |} | ||
| Line 39: | Line 40: | ||
==Resources and Citations== | ==Resources and Citations== | ||
* Gem Identification Lab Manual, Gemological Institute of America, 2016. | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | ||
| + | * Wikipedia: [https://en.wikipedia.org/wiki/Spessartine Spessartine] (Accessed Dec 2022) | ||
* Jack Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982. | * Jack Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982. | ||
* Mineralogy Database: [http://www.webmineral.com/data/Spessartine.shtml Spessartine] | * Mineralogy Database: [http://www.webmineral.com/data/Spessartine.shtml Spessartine] | ||
Latest revision as of 11:51, 23 December 2022
Spessartine garnet; image credit Rob Lavinsky, iRocks.com
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
- Isometric crystal system with massive to crystalline habit
- Cleavage = none
- Fracture = conchoidal
- Luster = vitreous to resinous
- Streak = colorless to white
- Fluorescence = inert
- Birefringence = none
| Composition | 3MnO-Al2O3-3SiO2 |
|---|---|
| Mohs Hardness | 6.5 - 7.5 |
| Density | 4.15 g/ml |
| Refractive Index | 1.800-1.810 |
| Dispersion | 0.027 (weak fire) |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Wikipedia: Spessartine (Accessed Dec 2022)
- 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