Friedelite

Big Photo

New Jersey, USA
1.29 carats
© Rarestone.com

Friedelite is named after Charles Friedel, French mineralogist and chemist.

Friedelite is usually massive but may also form tabular crystals. Transparent rose-red to orange-red material has been faceted and cut into cabochons.

Friedelite Gemstones by Colour

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

Friedelite Gemstones by Size

This table shows distribution of Friedelite 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:0.87 cts
Heaviest:9.97 cts
Average:3.55 cts
Total photos:6
Do you have a larger Friedelite? Why not upload a photo?
0.87ct to 1.78ct1.78ct to 2.69ct2.69ct to 3.60ct3.60ct to 4.51ct4.51ct to 5.42ct5.42ct to 6.33ct6.33ct to 7.24ct7.24ct to 8.15ct8.15ct to 9.06ct9.06ct to 9.97ct
General Information
Chemical Formula
Mn
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Friedelite
Mohs Hardness4 to 5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.06 to 3.19
Walter Schumann, Gemstones of the world (2001)
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Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven
Arthur Thomas, Gemstones (2009) Tough
Optical Properties of Friedelite
Refractive Index1.627 to 1.663
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.032 to 0.035
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismNil
Arthur Thomas, Gemstones (2009)
DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Pink, red, brown, yellow
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTranslucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Reddish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Fluorescence (Short Wave UV)Some specimens have shown green fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (Long-Wave UV)Some specimens have shown yellow fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Friedelite
Crystal SystemMonoclinic
Walter Schumann, Gemstones of the world (2001) Pseudo-trigonalMore from other references
HabitPseudohexagonal tablets
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Occur in metamorphosed manganese–iron deposits
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Friedelite information at mindat.org
Significant Gem Localities
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 413
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