Phosgenite

Big Photo

Sardinia, Italy
8.61 carats
© Mineral Classics

The name phosgenite derives from the chemical term "phosgene", carbonyl chloride, which elements are present in the mineral.

Phosgenite forms transparent to translucent colourless, white, yellowish, greenish, pinkish prismatic crystals with high adamantine lustre, which is caused by its lead content.

Facet-grade rough is rare.

Phosgenite Gemstones by Colour

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

Phosgenite Gemstones by Size

This table shows distribution of Phosgenite 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:1.62 cts
Heaviest:17.81 cts
Average:8.20 cts
Total photos:5
Do you have a larger Phosgenite? Why not upload a photo?
1.62ct to 3.24ct3.24ct to 4.86ct4.86ct to 6.48ct6.48ct to 8.10ct8.10ct to 9.72ct9.72ct to 11.33ct11.33ct to 12.95ct12.95ct to 14.57ct14.57ct to 16.19ct16.19ct to 17.81ct
General Information
Chemical Formula
Pb
 
2
(CO
 
3
)Cl
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Phosgenite
Mohs Hardness2 to 3
Walter Schumann, Gemstones of the world (2001)
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Specific Gravity6.13
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Phosgenite
Refractive Index2.117 to 2.145
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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Birefringence0.028
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismWeak
Arthur Thomas, Gemstones (2009)
DispersionStrong
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, white, yellowish, greenish.
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreAdamantine,Greasy
Walter Schumann, Gemstones of the world (2001)
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Fluorescence & other light emissions
Fluorescence (General)LW and SW: strong yellow with yellow phosphorescence
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Fluorescence (Long-Wave UV)Yellow
Arthur Thomas, Gemstones (2009)
Crystallography of Phosgenite
Crystal SystemTetragonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitShort prismatic to prismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Phosgenite occurs from the alteration of galena in the oxidized zone of lead ore deposits.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Phosgenite information at mindat.org
Significant Gem Localities
Italy
 
    • South Sardinia Province
      • Guspini
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 437
      • Iglesias
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 437
Namibia
 
  • Oshikoto Region
    • Tsumeb
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 437
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