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Mineralpedia Details for Phosgenite

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Phosgenite

Phosgenite

Named for phosgene, COCl2, which is composed of elements in Phosgenite’s composition. Phosgenite is an uncommon mineral found in England, Italy, Greece, Poland, Russia, Morocco, Tunisia, Namibia, Australia, Mexico, the United States and other localities in small amounts. Phosgenite is an alteration mineral formed from the oxidation of galena in hydrothermal lead deposits, and can also be formed as a reaction between sea water and lead minerals. Can fluoresce yellow under long-wave ultraviolet light, X-rays, and electron beams.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/phosgenite.pdf

Formula
Pb2CO3Cl2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Tabular, Massive - Granular 
Cleavage
Good, Good, Indistinct 
Luster
Adamantine 
Color
white, gray, brownish yellow, greenish white, pinkish white 
Streak
white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Sectile 
Hardness
2.5-3 
WebMineral
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Mindat
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Phosgenite from Monteponi mine, Iglesias, Sardinia, Italy

Phosgenite
            from Monteponi mine, Iglesias, Sardinia, Italy

Several amber to honey yellow crystals of Phosgenite from 3 to 6cm in size. The prism faces are deeply striated and each crystal exhibits flat pinacoidal terminations. Very fluorescent orange-yellow under longwave UV (as shown).

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Phosgenite from Glen Osmond mine, Glen Osmond, South Australia, Australia

Phosgenite
            from Glen Osmond mine, Glen Osmond, South Australia, Australia Clear prismatic crystals to 6mm. Rich with good coverage. This was a small find in the 1970's and was the first metal mine in Australia. My source says that as far as he knows these have never appeared on the market. If you are an Australian collector, you need this one.
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Phosgenite from Terrible mine, Custer Co., Colorado, United States

Phosgenite
            from Terrible mine, Custer Co., Colorado, United States
Special Info
Antique Specimen

Grey or white to brown massive with crystalline cleavages. This is just an old-time mass from this now extinct locality. 

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PHOSGENITE from Tolcarne Mine, Newquay, St. Agnes, Cornwall, England

PHOSGENITE
            from Tolcarne Mine, Newquay, St. Agnes,  Cornwall, England

Tiny 1-2mm crystals of Phosgenite across matrix. 

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