Epidote

Big Photo

Sri Lanka
0.52 carats
© Rarestone.com

Epidote (Greek - addition) is named after the numerous crystal faces.

Relatively large crystals of flawless facet rough are not uncommon, but faceted stones are limited to small sizes and may appear black because of the dark tone of the material.

Epidote Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 

Epidote Gemstones by Size

This table shows distribution of Epidote gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.52 cts
Heaviest:15.97 cts
Average:5.27 cts
Total photos:5
Do you have a larger Epidote? Why not upload a photo?
0.52ct to 2.07ct2.07ct to 3.61ct3.61ct to 5.16ct5.16ct to 6.70ct6.70ct to 8.25ct8.25ct to 9.79ct9.79ct to 11.34ct11.34ct to 12.88ct12.88ct to 14.43ct14.43ct to 15.97ct
General Information
Chemical Formula
CaAl
 
2
(Fe
3+
 
,Al)Si
 
3
O
 
12
(OH)
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Epidote
Mohs Hardness6 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity3.25 to 3.50
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
FractureConchoidal,Splintery
Walter Schumann, Gemstones of the world (2001)
More from other references
Optical Properties of Epidote
Refractive Index1.729 to 1.768
Walter Schumann, Gemstones of the world (2001)
More from other references
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.014 to 0.045
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
PleochroismOrange/brown stones - strong trichroism: green to strong green - light brown to brown - yellow to colorless; Green stones - strong: green - brown - yellow to colorless
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Orange/brown stones - strong: green - brown -yellow to colorlessMore from other references
Dispersion0.030
Arthur Thomas, Gemstones (2009)
ChatoyancyRare
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Green, yellowish-green, brownish-green, brown, reddish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)None
Walter Schumann, Gemstones of the world (2001)
Crystallography of Epidote
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitPrismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:Most originate in low- to medium-grade metamorphic rocks.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Inclusions in Epidote
Needle-like crystals, distinct growth zoning - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 21
Further Information
Mineral information:Epidote information at mindat.org
Significant Gem Localities
Austria
 
  • Salzburg
    • Zell am See District
      • Neukirchen am Großvenediger
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 409
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
No reference listed
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.