Difference between revisions of "Epidote"

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[[File:pe20807epidote.jpg|thumb|Epidote]]
 
[[File:pe20807epidote.jpg|thumb|Epidote]]
 
== Description ==
 
== Description ==
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[[File:Epidote R050064 Sample Photo 23079 M.jpg|thumb|Prismatic epidote crystals from [https://rruff.info/epidote/display=default/R050064 RRUFF]]]
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A hydrated calcium aluminum iron silicate used occasionally as a [http://cameo.mfa.org/materials/fullrecord.asp?name=gemstone gemstone]. Epidote has prismatic shaped crystals that are usually a transparent pistachio green, although its color may vary from a light yellow green to a darker brownish green. Epidote occurs in metamorphic rocks such as [http://cameo.mfa.org/materials/fullrecord.asp?name=gneiss gneisses] and [http://cameo.mfa.org/materials/fullrecord.asp?name=schist schists]. Notable occurrences have been found in the Urals, Austria, Switzerland, Italy, France, Norway, Mexico, and the United States (Alaska, Idaho, New Hampshire, Massachusetts, Connecticut, Colorado, California).
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A hydrated calcium aluminum iron silicate used occasionally as a [[gemstone]]. Epidote has prismatic shaped crystals that are usually a transparent to translucent pistachio green, although its color may vary from a light yellow green to a darker brownish green. Epidote occurs in metamorphic rocks such as [[gneiss|gneisses]] and [[schist|schists]]. Notable occurrences have been found in the Urals, Austria, Switzerland, Italy, France, Norway, Mexico, and the United States (Alaska, Idaho, New Hampshire, Massachusetts, Connecticut, Colorado, California).
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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pistacite; piedmontite (manganese rich); Epidot (Deut.); epidota (Esp.); epidoto (Port.); epidoot (Ned.);
 
pistacite; piedmontite (manganese rich); Epidot (Deut.); epidota (Esp.); epidoto (Port.); epidoot (Ned.);
  
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[[[SliderGallery rightalign|Epidoteitaly1.jpg~Raman]]]
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[[[SliderGallery rightalign|Epidote, Prince of Wales Island.PNG~FTIR (MFA)|Epidoteitaly1.jpg~Raman (U of Parma)|Epidote IR-ATR 40089 RRUFF.png~IR-ATR (RRUFF)|Epidote Raman 40089 RRUFF.png~Raman (RRUFF)]]]
  
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== Other Properties ==
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== Physical and Chemical Properties ==
  
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Slender, prismatic monoclinic crystals with striations. Perfect cleavage on one plane. Fracture = uneven. Luster = vitreous. Streak = colorless to gray
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* Monoclinic system with slender, prismatic or fibrous crystals
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* Perfect cleavage on one plane  
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* Fracture = uneven to flat
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* Luster = vitreous to greasy  
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* Streak = colorless to gray
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* Fluorescence = generally inert
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* Pleochroism = trichroism showing strong green, brown and yellow
  
 
{| class="wikitable"
 
{| class="wikitable"
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|-
 
|-
 
! scope="row"| Density
 
! scope="row"| Density
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| 3.3-3.6
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| 3.3-3.6 g/ml
 
|-
 
|-
 
! scope="row"| Refractive Index
 
! scope="row"| Refractive Index
 
| 1.71 - 1.83
 
| 1.71 - 1.83
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|-
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! scope="row"| Birefringence
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| 0.019 - 0.045
 
|}
 
|}
  
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== Additional Information ==
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==Resources and Citations==
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* Gem Identification Lab Manual, Gemological Institute of America, 2016.
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Mineralogy Database: [http://www.webmineral.com/data/Epidote.shtml Epidote]
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* Mineralogy Database: [http://www.webmineral.com/data/Epidote.shtml Epidote]
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== Authority ==
 
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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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* Wikipedia: [https://en.wikipedia.org/wiki/Epidote Epidote] (Accessed Sept. 7, 2005 and Dec 2022)
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* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Epidote (Accessed Sept. 7, 2005)
 
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* ''CRC Handbook of Chemistry and Physics'', Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980  Comment: density=3.25-3.50
 
* ''CRC Handbook of Chemistry and Physics'', Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980  Comment: density=3.25-3.50
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* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942
 
* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942
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* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
 
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
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* 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
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* ''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
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "epidote" [Accessed December 11, 2001]. (color photo)(tech info)
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "epidote" Encyclopædia Britannica [Accessed December 11, 2001]. (color photo)(tech info)
 
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 14:09, 20 December 2022

Epidote

Description

Prismatic epidote crystals from RRUFF

A hydrated calcium aluminum iron silicate used occasionally as a Gemstone. Epidote has prismatic shaped crystals that are usually a transparent to translucent pistachio green, although its color may vary from a light yellow green to a darker brownish green. Epidote occurs in metamorphic rocks such as gneisses and schists. Notable occurrences have been found in the Urals, Austria, Switzerland, Italy, France, Norway, Mexico, and the United States (Alaska, Idaho, New Hampshire, Massachusetts, Connecticut, Colorado, California).

Synonyms and Related Terms

pistacite; piedmontite (manganese rich); Epidot (Deut.); epidota (Esp.); epidoto (Port.); epidoot (Ned.);

FTIR (MFA)

Epidote, Prince of Wales Island.PNG

Raman (U of Parma)

Epidoteitaly1.jpg

IR-ATR (RRUFF)

Epidote IR-ATR 40089 RRUFF.png

Raman (RRUFF)

Epidote Raman 40089 RRUFF.png


Physical and Chemical Properties

  • Monoclinic system with slender, prismatic or fibrous crystals
  • Perfect cleavage on one plane
  • Fracture = uneven to flat
  • Luster = vitreous to greasy
  • Streak = colorless to gray
  • Fluorescence = generally inert
  • Pleochroism = trichroism showing strong green, brown and yellow
Composition Ca2(Al, Fe)3(SiO4)3OH
Mohs Hardness 6 - 7
Density 3.3-3.6 g/ml
Refractive Index 1.71 - 1.83
Birefringence 0.019 - 0.045

Resources and Citations

  • Gem Identification Lab Manual, Gemological Institute of America, 2016.
  • Mineralogy Database: Epidote
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Wikipedia: Epidote (Accessed Sept. 7, 2005 and Dec 2022)
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=3.25-3.50
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • 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
  • Encyclopedia Britannica, http://www.britannica.com Comment: "epidote" [Accessed December 11, 2001]. (color photo)(tech info)

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