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Proustite

Big Photo

Rectangle-cut corners proustite
12.27 carats
© Rarestone.com

Proustite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
Chemical Formula
Ag
 
3
AsS
 
3
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Physical Properties of Proustite
Mohs Hardness2.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity5.51 to 5.64
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Arthur Thomas, Gemstones (2009)
Cleavage QualityDistinct
Arthur Thomas, Gemstones (2009)
FractureUneven,Conchoidal
Arthur Thomas, Gemstones (2009)
Light SensitivityOften darkens with exposure to light
Michael O’Donoghue, Gems, Sixth Edition (2006)
Optical Properties of Proustite
Refractive Index2.792 to 3.087
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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Birefringence0.295
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismStrong
Arthur Thomas, Gemstones (2009)
DispersionWeak
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Dark red
Michael O’Donoghue, Gems, Sixth Edition (2006)
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TransparencyOpaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references
LustreAdamantine
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Crystallography of Proustite
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitRhombohedral, prismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Proustite occurs as a late-forming mineral in hydrothermal deposits in the oxidized
and enriched zone, with other silver minerals and sulphides.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Proustite information at mindat.org
Significant Gem Localities
Chile
 
  • Atacama
    • CopiapĂł Province
      • CopiapĂł
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 440
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