Hessite

tellurium

petzite

Formula: Ag2Te
Telluride
Specific gravity: 8.24 to 8.45
Hardness: 2 to 3
Streak: Black
Colour: Lead-grey, steel-grey
Environments

Placers
Hydrothermal environments

Hessite is widely distributed in tellurium-rich silver-gold ores (Dana). It occurs in hydrothermal medium- and low-temperature veins, and also in small quantities in some massive pyrite deposits (HOM). It is typically found in precious metal-telluride associations, occurring with gold, bismuth, lead, silver or gold tellurides in quartz-carbonate lodes and stockworks (MW).
Other associated minerals include calaverite, sylvanite, altaite, petzite, empressite, rickardite, gold, tellurium, pyrite, galena, tetrahedrite and chalcopyrite (HOM).

At the Con West property, Taseko Lake Area, Clinton Mining Division, British Columbia, Canada, hessite has been found as small grains embedded in chalcopyrite (AM 34.354-356).

At the Pellaire Gold Mines property, Taseko Lake, Clinton Mining Division, British Columbia, Canada, hessite has been found as small grains with native gold (AM 34.354-356).

At the Hedley Monarch Mine, Olalla, Osoyoos Mining Division, British Columbia, Canada, hessite has been found in contact with altaite and petzite (AM 34.354-356).

At the MarbleBay and Little Billie mines, Texada Island, British Columbia, Canada, hessite has been found in minute amounts in close association with chalcopyrite and bornite (AM 34.354-356).

At the Hollinger Mine, Tisdale Township, Porcupine mining district, Timmins area, Cochrane District, Ontario, Canada, hessite has been found as thin films on cleavage planes of ankerite (AM 34.354-356).

At a prospect in Tisdale Township, Porcupine mining district, Timmins area, Cochrane District, Ontario, Canada, a specimen of vein quartz has been found with a small area of hessite and gold at the contact of a serpentine stringer (AM 34.354-356).

At the Ardeen Mine, Moss Township, Thunder Bay District, Ontario, Canada, grains of hessite and altaite have been found in a gangue of quartz and calcite; also, hessite has been found together with petzite, as a massive crust on one surface of vein quartz with gold (AM 34.354-356).

At the Kirkland Lake Mine, Kirkland Lake Township, Timiskaming District, Ontario, Canada, hessite has been found as coarsely crystalline calcite with grains of hessite associated with small compact masses of coloradoite, chalcopyrite and tetrahedrite (AM 34.354-356).

At the East Sullivan mine, Val d'Or, La Vallée-de-l'Or RCM, Abitibi-Témiscamingue, Québec, Canada, hessite occurs as disseminated grains in quartz and associated with tourmaline, pyrite, chalcopyrite and gold (AM 34.354-356).

At Burwash Creek, Kluane District, Whitehorse mining district, Yukon, Canada, hessite has been found in a number of small nuggets of gold from the placer workings (AM 34.354-356)

At the Buffalo Hump Group on Mount Stevens, Wheaton River District, Whitehorse mining district, Yukon, Canada, hessite has been found as sparse disseminations in quartz with galena (AM 34.354-356).

At the Emperor Mine, Vatukoula, Tavua Gold Field, Viti Levu, Fiji, hessite occurs with sylvanite and gold (Minrec 39.4.299).

The type locality is the Second Zavodinskii Mine, Zyryan District, East Kazakhstan, Kazakhstan.

At Botești, Zlatna, Alba, Romania, hessite has been confirmed on a specimen of crystalline sphalerite with a few poorly developed crystals of hessite on a group of compact quartz crystals (AM 34.354-356). It has also been reported from this locality with gold and calcite (R&M 84.6.535).

At Clogau Mine, Bontddu, Gwynedd, Wales, UK, hessite is present in the localised ore-zones where gold and tellurides are present. Samples have been found of hessite associated with tellurobismuthite, tetradymite, galena and chalcopyrite cementing shattered arsenopyrite (MW).

At Otto Mountain, near Baker, California, USA, Primary hessite occurs as tiny blebs either associated with pyrite or galena, or isolated in quartz (R&M 86.2.138).

At the Cripple Creek mining district, Colorado, USA, hessite has been found as microscopic grains in calaverite (Minrec 36.2.173).

Common impurities: Au,Pb

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