Spessartine: Difference between revisions

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[[File:Spessartine-t08-49a.jpg|thumb|Spessartine garnet; image credit Rob Lavinsky, [https://www.irocks.com/ iRocks.com]]]
== Description ==
[[File:ps30275spessartine.jpg|thumb|Spessartine]]
[[File:ps30275spessartine.jpg|thumb|Spessartine]]
== Description ==
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 [http://cameo.mfa.org/materials/fullrecord.asp?name=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 [http://cameo.mfa.org/materials/fullrecord.asp?name=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 IR-ATR RRUFF R050063.png~IR-ATR (RRUFF)|Spessartine Raman RRUFF R050063.png~Raman (RRUFF)|spessartineRS.jpg~Raman (RASMIN)]]]
[[[SliderGallery rightalign|spessartineRS.jpg~Raman]]]
== Physical and Chemical Properties ==
 
* Isometric crystal system with massive to crystalline habit
== Other Properties ==
* Cleavage = none
 
* Fracture = conchoidal   
Fracture = conchoidal. Luster = vitreous to resinous. Streak = colorless.
* Luster = vitreous to resinous   
* Streak = colorless to white
* Fluorescence = inert
* Birefringence =  none


{| class="wikitable"
{| class="wikitable"
Line 20: Line 22:
|-
|-
! scope="row"| Mohs Hardness
! scope="row"| Mohs Hardness
| 7.0 - 7.5
| 6.5 - 7.5
|-
|-
! 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
|-
! scope="row"| Dispersion
| 0.027 (weak fire)
|}
|}
== 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]


== Comparisons ==
== Comparisons ==
Line 37: Line 38:
[[media:download_file_452.pdf|Properties of Common Gemstones]]
[[media:download_file_452.pdf|Properties of Common Gemstones]]


 
==Resources and Citations==
 
* Gem Identification Lab Manual, Gemological Institute of America, 2016.
== Sources Checked for Data in Record ==
* Wikipedia: [https://en.wikipedia.org/wiki/Spessartine Spessartine] (Accessed Dec 2022)
 
* 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 .
* 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
* 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
* 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


Latest revision as of 13:51, 23 December 2022

Spessartine garnet; image credit Rob Lavinsky, iRocks.com

Description

Spessartine

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.)

IR-ATR (RRUFF)

Spessartine IR-ATR RRUFF R050063.png

Raman (RRUFF)

Spessartine Raman RRUFF R050063.png

Raman (RASMIN)

SpessartineRS.jpg

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
Retrieved from "https://cameo.mfa.org/index.php?title=Spessartine&oldid=95222"