Sulfides: pyrargyrite
Diagnostic Card.
Ag 3 Sb S 3
Crystal system trigonal
Hardness of 2.5-3
Specific Gravity 5.85
Cleavage is good
Fracture conchoidal, wrong
Color: red-brown
Color in light red powder
Shine on Diamond to semimetallic
Red silver ore (silver snag). The collective term that combines two related minerals: lighter - proustite Ag3AsS3 and dark - pyrargyrite Ag3SbS3. Diamond Gloss to metallovidnogo, transparent or translucent. Colours: red or lead-gray, in fragments of thin ruby red. The bar is bright red, purple-red. Fracture conchoidal, splintery, fragile. Cleavage is perfect. Formed in the lead-silver deposits. The crystals (trigonal system) prismatic, often twinned, there are also dense aggregates. Deposits: in Saxony (Germany), the Czech Republic, Spain, Canada, USA, Peru, Bolivia, Chile.
The crystals are rhombohedral, prismatic or scalenohedral. Rayed in the fresh state; It has a diamond or a half-metallic luster. Easily decomposed by the cleavage; fracture conchoidal or wrong. The hardness is very low. More often than crystals found in solid or granular form.
Chemical composition. Silver (Ag) 59,4%, antimony (Sb) 22,3%, sulfur (S) 18,2%. Fluctuations in the composition are insignificant. Transparency. Transparent, translucent red. Class symmetry. Ditrigonalno-p.iramidalny - Sm. Form crystalline precipitates. Dense mass, prismatic, scalenohedral, tolstotablitchatye, rhombohedral, rich crystal face. Cleavage. Clear on the (1011)
Diagnostic features.
Easily confused with proustite. When exposed to light generated silver plaque. Soluble in nitric acid, and melts easily.
Origin.
Pyrargyrite found in low-temperature hydrothermal veins. He also noted among the silver and the silver sulfide galena other oxidation products.
Place of Birth.
In Italy met in a few places. The best specimens come from the Sarrabus silver mine. Nowadays good examples of crystals come primarily from Peru (Kasapalka, Castrovirreyna, Vinchos), Chile (Chanyarsilo) and Mexico (Zacatecas). Pyrargyrite belongs to the rich silver ores. pyrargyrite Crystals have a regular polyhedral shape (form 80). Sulfide - arsenic As may contain instead of sulfur S.
Pyrargyrite (cr-ly to 1.5 cm). Andreasberg, Harz, Germany, the European Union. Photo: © AA Evseev.
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