Pyrite

Big Photo

Bolivia
10.90 carats
© Giovanni Scapin 2015

The name pyrite derived from Greek - fire, as it produces sparks when knocked. Because of its similarity to gold, pyrite is often called Fool's gold. It is metallic shiny and has pale brass-yellow hue.
General Information
Other Names/Trade Names:
Chemical Formula
FeS
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Pyrite
Mohs Hardness6 to 6.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity5.00 to 5.20
Walter Schumann, Gemstones of the world (2001)
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TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityIndistinct
Walter Schumann, Gemstones of the world (2001)
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FractureUneven,Conchoidal
Walter Schumann, Gemstones of the world (2001)
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Optical Properties of Pyrite
Refractive IndexCannot be determined
Walter Schumann, Gemstones of the world (2001)
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Optical CharacterIsotropic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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BirefringenceNone
Walter Schumann, Gemstones of the world (2001)
PleochroismAbsent
Walter Schumann, Gemstones of the world (2001)
DispersionNone
Walter Schumann, Gemstones of the world (2001)
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Colour
Colour (General)Brassy yellow to silver
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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TransparencyOpaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreMetallic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Strong metallic lusterMore from other references
Fluorescence & other light emissions
Fluorescence (General)None
Walter Schumann, Gemstones of the world (2001)
Crystallography of Pyrite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitPyritohedral, octahedral, penetration and contact twins and granular and stalactitic
masses are also common
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Pyrite forms under a number of different conditions and in many different rock types.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Pyrite information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Chaung-gyi
Ted Themelis (2008) Gems & mines of Mogok
        • Kyauk-Pyat-That
Ted Themelis (2008) Gems & mines of Mogok
        • Marble Ark
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Mogok Valley
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Peru
 
  • Áncash
    • Bolognesi Province
      • Huallanca District
        • Huallanca
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