Difference between revisions of "Almandine"

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[[File:SC296809.jpg|thumb|Almandine garnet<br>MFA# 52.528]]
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== Description ==
 
[[File:pa30276almandine2.jpg|thumb|almandine]]
 
[[File:pa30276almandine2.jpg|thumb|almandine]]
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== Description ==
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A red [[garnet|garnet]] composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut [[cabochon|en cabochon]] then called carbuncle.
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A red [http://cameo.mfa.org/materials/fullrecord.asp?name=garnet garnet] composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut [http://cameo.mfa.org/materials/fullrecord.asp?name=cabochon en cabochon] then called carbuncle.
 
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)
 
almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)
  
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[[[SliderGallery rightalign|almandineRS.jpg~Raman]]]
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[[File:Almandine IR-ATR R040079.png|thumb|IR-ATR of almandine<br>Image Credit: [https://rruff.info/almandine/display=default/R040079 RRUFF]]]
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[[File:Almandine Raman RRUFF R040079.png|thumb|Raman of almandine<br>Image Credit: [https://rruff.info/almandine/display=default/R040079 RRUFF]]]
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== Other Properties ==
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== Physical and Chemical Properties ==
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Fracture = conchoidal.  Luster = vitreous to resinous.  Streak = colorless.  Birefringence = none.  Dispersion = 0.024.  Pleochroism = none.  UV fluorescence = inert
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* Fracture = conchoidal.   
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* Luster = vitreous to resinous.   
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* Streak = colorless.   
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* Birefringence = none.   
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* Pleochroism = none.   
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* UV fluorescence = inert
  
 
{| class="wikitable"
 
{| class="wikitable"
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|-
 
|-
 
! scope="row"| Density
 
! scope="row"| Density
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| 4.05 - 4.3
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| 4.05 - 4.3 g/ml
 
|-
 
|-
 
! scope="row"| Refractive Index
 
! scope="row"| Refractive Index
 
| 1.79-1.83
 
| 1.79-1.83
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|-
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! scope="row"| Dispersion
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| 0.024
 
|}
 
|}
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== Additional Information ==
 
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Mineralogy Database: [http://www.webmineral.com/data/Almandine.shtml Almandine]
 
  
 
== Comparisons ==
 
== Comparisons ==
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[[media:download_file_395.pdf|Properties of Gemstones]]
 
[[media:download_file_395.pdf|Properties of Gemstones]]
  
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== Resources and Citations ==
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* Gem Identification Lab Manual, Gemological Institute of America, 2016.
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== Authority ==
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* Mineralogy Database: [http://www.webmineral.com/data/Almandine.shtml Almandine]
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* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 752
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 752
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: 'almandine" [Accessed May 8, 2003]
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: 'almandine" from Encyclopædia Britannica Premium Service.  [Accessed May 8, 2003
 
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* 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
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* Sue Fuller, ''Rocks and Minerals'', DK Publishing, Inc., New York City, 1995
 
* Sue Fuller, ''Rocks and Minerals'', DK Publishing, Inc., New York City, 1995
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* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
 
* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
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* Wikipedia: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)
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* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)
 
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 14:48, 10 December 2022

Almandine garnet
MFA# 52.528

Description

almandine

A red Garnet composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut en cabochon then called carbuncle.

Synonyms and Related Terms

almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)

IR-ATR of almandine
Image Credit: RRUFF
Raman of almandine
Image Credit: RRUFF

Physical and Chemical Properties

  • Fracture = conchoidal.
  • Luster = vitreous to resinous.
  • Streak = colorless.
  • Birefringence = none.
  • Pleochroism = none.
  • UV fluorescence = inert
Composition Fe3Al2Si3O12
Mohs Hardness 7.0-7.5
Density 4.05 - 4.3 g/ml
Refractive Index 1.79-1.83
Dispersion 0.024

Comparisons

Properties of Gemstones

Resources and Citations

  • Gem Identification Lab Manual, Gemological Institute of America, 2016.
  • Mineralogy Database: Almandine
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 752
  • Encyclopedia Britannica, http://www.britannica.com Comment: 'almandine" [Accessed May 8, 2003]
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Sue Fuller, Rocks and Minerals, DK Publishing, Inc., New York City, 1995
  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • Wikipedia: http://en.wikipedia.org/wiki/Almandine (accessed June 2004)

Retrieved from "https://cameo.mfa.org/index.php?title=Almandine&oldid=94910"