Stützite

stutzite

sylvanite

altaite

hessite

Formula: Ag5-xTe3 (x = 0.24-0.36)
Telluride
Specific gravity: 8
Hardness: 3½
Streak: Grey-black
Colour: Dark lead-grey, bronze-brown to iridescent (tarnished)
Environments

Hydrothermal environments

Stützite occurs as replacement masses in hydrothermal deposits associated with other tellurides and sulphides. Associated minerals include sylvanite, hessite, altaite, petzite, empressite, tellurium, gold, galena, sphalerite, colusite, tetrahedritetennantite and pyrite (HOM).

Localities

In Kalgoorlie-Boulder Shire, Western Australia, a single specimen has been found of stützite associated with sylvanite (AM 49.325-338).

At the Vatukoula Gold Field, Viti Levu, Fiji, the observed associations are stützite-sylvanite, stützite-tellurium, stützite-tellurium-sylvanite, and stützite-tellurium-coloradoite (AM 49.325-338).

At the type locality, Săcărâmb, Certeju de Sus, Deva, Hunedoara, Romania, stützite was found in a single specimen associated with gold and hessite on quartz (AM 36.458-469).

At the Red Cloud mine, Gold Hill district, Boulder county, Colorado, USA, stützite occurs associated with altaite. Other tellurides from this mine include hessite, petzite and sylvanite (AM 49.325-338).

At the May Day mine, La Plata district, La Plata County, Colorado, USA, stützite is an abundant constituent of telluride replacement masses, and was observed in the associations stützite-sylvanite, stützite-hessite-sylvanite, and stützite-altaite. Sulphide minerals are commonly intergrown with the tellurides and include galena, sphalerite and tetrahedritetennantite (AM 49.325-338).

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