Sulphides: Silvanit
Diagnostic card.
Ag Au Te 4
Singonia monoclinic
Hardness 7,9-8,3
Specific weight 4.9-5.4
Cleavage is perfect
Color gray
Color in powder gray, with a yellow tinge
Glitter metal
Presented as tabular or short-prismatic crystals, with numerous faces, or in the form of dendrites, as well as granular aggregates. The color is silvery white, with a yellow tinge. Crystals, dendritic secretions, reminiscent of letters (from where the names "written tellurium", etc.), granular aggregates. Over 60 forms were observed on the crystals. Crystals are very diverse in appearance.
Diagnostic signs.
Secondary changes are seen on the surface when viewed in bright light. Decomposes HNO3, releasing a precipitate of Au rust color. Addition to the solution of HCl causes the appearance of a white, curdled AgCl precipitate. Hot concentrated H2SO4 stains in a characteristic crimson color. In the polisher, sl. Etched by HNO3. The rest of the reagents do not work.
Origin.
Distributed in igneous rocks, in association with sphalerite, pyrite and tellurite; Occurs in gold-bearing veins.
Place of Birth.
Met in Transylvania (Romania) with native gold, pyrite, siderite, rhodochrosite; In Cripple Creek in the state of Colorado - with krennerite and ka-laverite. It is reported about his discovery in the state of California and the state of Idaho (USA), in Kalgoorlie (Australia) and Canada. On gold-bearing veins in Romania, the silvanite forms typical hieroglyphoid manifestations.
Application.
Silvanite is mined to produce three metals that are part of its composition (silver, gold and tellurium). Tellurium amalgam. Can be poisonous (tellurium, gold, silver, sulfur). Similar to arsenopyrite - arsenic, iron and sulfur.
Silvanite in quartz. Emperor of Mine (Mine), Fiji, Pacific Ocean. Photo: © А.А. Evseev.
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