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Argyrodite with Miargyrite, Stephanite, Diaphorite & Polybasite

#50380

Argyrodite with Miargyrite, Stephanite, Diaphorite & Polybasite

#50380
Availability
Sold
Size
6 x 4.5 x 2.5 cm - Sm Cabinet 
Formula
Ag8GeS6 (RRUFF)
Locality
Santiago Alto mine, Porco, Antonio Quijarro prov., Potosi, Bolivia
Tagged
sulfide , silver

Excellent specimen with several rare sulfosalts including Pyrargyrite (cherry red internal reflections) which is most of the matrix. The Argyrodite is in veins and is dull black and spongy. The rest of it is obscure and I can't really discern any of them with certainty. These include the Stephanite, Polybasite, Diaphorite, and Acanthite. The red you see in the photos I believe to be Sphalerite. The specimen was formerly in the Werner Paar collection. Werner is an expert in the mineralogy of sulfosalts, especially of this locality. Comes with Paar's personal label as seen in the prov. tab. Paar placed a catalog number on the specimen, which matches to label.

Argyrodite

Formula
Ag8GeS6 
Crystal System
Orthorhombic 
Crystal Habit
Subhedral Crystals, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
black, steel gray 
Streak
grayish black 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Ex. Dr. Werner Paar Collection

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