Difference between revisions of "Peridot"

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[[File:1998.569-SC8319.jpg|thumb|'''MFA Acc. #:''' 1998.569]]
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[[File:Peridot 2016391.jpg|thumb|Peridot necklace<br>MFA# 2016.391]]
 
== Description ==
 
== Description ==
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[[File:1998.569-SC8319.jpg|thumb|Jeweled brooch<br>MFA # 1998.569]]
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A transparent, yellow-green [http://cameo.mfa.org/materials/fullrecord.asp?name=gemstone gemstone]. Peridot is a transparent form of [http://cameo.mfa.org/materials/fullrecord.asp?name=olivine olivine] that was known in ancient Greece and in Egypt. Many of the green stones worn by Cleopatra were peridot. The main old world source for peridot was the island of Zabargad (St. John's Island) in the Red Sea. Peridot was called an evening emerald because it appears to lose its yellowish cast at night. It has sometimes been misidentified as emerald and as green glass. Former names include topaz (Greek) and zerberdjet (Persian). Peridots are still obtained from Zabargad and also from Brazil (Minas Gerais), South Africa, Kenya, China, Myanmar (formerly Burma, near Mogok), Norway (Sondmore), and the U.S. (Arizona, Hawaii).
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A transparent, yellow-green [[gemstone|gemstone]]. Peridot is a transparent form of [[olivine|olivine]] that was known in ancient Greece and in Egypt. Many of the green stones worn by Cleopatra were peridot. The main old world source for peridot was the island of Zabargad (St. John's Island) in the Red Sea. Peridot was called an evening emerald because it appears to lose its yellowish cast at night. It has sometimes been misidentified as emerald and as green glass. Former names include topaz (Greek) and zerberdjet (Persian). Peridots are still obtained from Zabargad and also from Brazil (Minas Gerais), South Africa, Kenya, China, Myanmar (formerly Burma, near Mogok), Norway (Sondmore), and the U.S. (Arizona, Hawaii).
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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olivine; forsterite; fayalite; zeberdjet; evening emerald; olivine, péridot (Fr.); peridoto (Esp., Port.); Peridot (Deut.); peridoot (Ned.)
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[[[SliderGallery rightalign|Fayalite, Upper Bear Creek CO.PNG~FTIR (MFA)|Forsterite IR-ATR RRUFF R040018.png~IR-ATR (RRUFF)|Forsterite Raman RRUFF R040018.png~Raman (RRUFF)|forsteriteRS.jpg~Raman (RASMIN)]]]
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== Physical and Chemical Properties ==
  
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olivine; zeberdjet; evening emerald; olivine, péridot (Fr.); peridoto (Esp., Port.); Peridot (Deut.); peridoot (Ned.)
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* Orthorhombic crystal system   
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* Fracture = conchoidal   
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== Other Properties ==
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* Luster = vitreous to oily  
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* Streak = colorless  
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Orthorhombic crystal system.  
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* Fluorescence = none
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* Pleochroism = weak yellow-green and green (noticeable only in dark stones)
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Fracture = conchoidal to uneven. Luster = vitreous. Streak = colorless. 
 
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Fluorescence = none
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
 
! scope="row"| Composition
 
! scope="row"| Composition
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| (Mg,Fe)2SiO4
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| (Mg,Fe)<sub>2</sub>SiO<sub>4</sub>
 
|-
 
|-
 
! scope="row"| Mohs Hardness
 
! scope="row"| Mohs Hardness
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| 6.5
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| 6.5 - 7.0
 
|-
 
|-
 
! scope="row"| Density
 
! scope="row"| Density
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| 3.22-3.40
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| 3.22-3.40 g/ml
 
|-
 
|-
 
! scope="row"| Refractive Index
 
! scope="row"| Refractive Index
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| 1.650-1.690
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| 1.64 - 1.70
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|-
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! scope="row"| Birefringence
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| 0.035 - 0.038 (usually 0.036, moderate doubling)
 
|}
 
|}
  
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[[media:download_file_428.pdf|Properties of Common Gemstones]]
 
[[media:download_file_428.pdf|Properties of Common 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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* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 561
 
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 561
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* Wikipedia: [https://en.wikipedia.org/wiki/Peridot Peridot] (Accessed Dec 2022)
 
* 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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* R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997
 
* R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997
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* Website: http://www.geo.utexas.edu/courses/347k/redesign/gem_notes/Peridot/peridot_triple_page.htm
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* Website address 1  Comment: http://www.geo.utexas.edu/courses/347k/redesign/gem_notes/Peridot/peridot_triple_page.htm
 
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* Yasukazu Suwa, ''Gemstones: Quality and Value, Volume 1'', Sekai Bunka Publishing Inc., Tokyo, 1999
 
* Yasukazu Suwa, ''Gemstones: Quality and Value, Volume 1'', Sekai Bunka Publishing Inc., Tokyo, 1999
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* Michael O'Donoghue and Louise Joyner, ''Identification of Gemstones'', Butterworth-Heinemann, Oxford, 2003
 
* Michael O'Donoghue and Louise Joyner, ''Identification of Gemstones'', Butterworth-Heinemann, Oxford, 2003
  

Latest revision as of 09:37, 21 December 2022

Peridot necklace
MFA# 2016.391

Description

Jeweled brooch
MFA # 1998.569

A transparent, yellow-green Gemstone. Peridot is a transparent form of Olivine that was known in ancient Greece and in Egypt. Many of the green stones worn by Cleopatra were peridot. The main old world source for peridot was the island of Zabargad (St. John's Island) in the Red Sea. Peridot was called an evening emerald because it appears to lose its yellowish cast at night. It has sometimes been misidentified as emerald and as green glass. Former names include topaz (Greek) and zerberdjet (Persian). Peridots are still obtained from Zabargad and also from Brazil (Minas Gerais), South Africa, Kenya, China, Myanmar (formerly Burma, near Mogok), Norway (Sondmore), and the U.S. (Arizona, Hawaii).

Synonyms and Related Terms

olivine; forsterite; fayalite; zeberdjet; evening emerald; olivine, péridot (Fr.); peridoto (Esp., Port.); Peridot (Deut.); peridoot (Ned.)

FTIR (MFA)

Fayalite, Upper Bear Creek CO.PNG

IR-ATR (RRUFF)

Forsterite IR-ATR RRUFF R040018.png

Raman (RRUFF)

Forsterite Raman RRUFF R040018.png

Raman (RASMIN)

ForsteriteRS.jpg

Physical and Chemical Properties

  • Orthorhombic crystal system
  • Fracture = conchoidal
  • Luster = vitreous to oily
  • Streak = colorless
  • Fluorescence = none
  • Pleochroism = weak yellow-green and green (noticeable only in dark stones)
Composition (Mg,Fe)2SiO4
Mohs Hardness 6.5 - 7.0
Density 3.22-3.40 g/ml
Refractive Index 1.64 - 1.70
Birefringence 0.035 - 0.038 (usually 0.036, moderate doubling)

Comparisons

Properties of Common Gemstones

Resources and Citations

  • Gem Identification Lab Manual, Gemological Institute of America, 2016.
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 561
  • Wikipedia: Peridot (Accessed Dec 2022)
  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • Website: http://www.geo.utexas.edu/courses/347k/redesign/gem_notes/Peridot/peridot_triple_page.htm
  • Yasukazu Suwa, Gemstones: Quality and Value, Volume 1, Sekai Bunka Publishing Inc., Tokyo, 1999
  • Michael O'Donoghue and Louise Joyner, Identification of Gemstones, Butterworth-Heinemann, Oxford, 2003

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