Pyrargyrite

Big Photo

Bolivia
0.94 carats
© Rarestone.com

Pyrargyrite is named after Greek "pyr" - fire and "argyros" - silver, alluding to its red colour and silver content.

Pyrargyrite forms translucent deep red prismatic crystals with adamantine lustre. The material can be very attractive but it may darken on exposure to light.

Transparent crytals of facet-grade are rare.

Pyrargyrite Gemstones by Colour

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

Pyrargyrite Gemstones by Size

This table shows distribution of Pyrargyrite 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:0.94 cts
Heaviest:12.83 cts
Average:6.88 cts
Total photos:2
Do you have a larger Pyrargyrite? Why not upload a photo?
0.94ct to 2.13ct2.13ct to 3.32ct3.32ct to 4.51ct4.51ct to 5.70ct5.70ct to 6.89ct6.89ct to 8.07ct8.07ct to 9.26ct9.26ct to 10.45ct10.45ct to 11.64ct11.64ct to 12.83ct
General Information
Chemical Formula
Ag
 
3
SbS
 
3
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Pyrargyrite
Mohs Hardness2.5 to 3
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity5.85
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of Mineralogy (2001)
Cleavage QualityIndistinct
Arthur Thomas, Gemstones (2009)
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FractureConchoidal
Arthur Thomas, Gemstones (2009)
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Light SensitivityMay darken on exposure to light
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Optical Properties of Pyrargyrite
Refractive Index2.881 to 3.084
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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Birefringence0.203
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismStrong
Arthur Thomas, Gemstones (2009)
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DispersionStrong
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Gray, black, red
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTranslucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Seldom transparentMore from other references
LustreAdamantine
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Crystallography of Pyrargyrite
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitPrismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Pyrargyrite occurs in hydrothermal veins as a primary late-stage low-temperature mineral.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Pyrargyrite information at mindat.org
Significant Gem Localities
Bolivia
 
  • Potosí
    • Chayanta Province
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 441
Chile
 
  • Atacama
    • Copiapó Province
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 441
Peru
 
  • Huancavelica
    • Castrovirreyna Province
      • Castrovirreyna District
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