Coloradoite

petzite

calaverite

Formula: HgTe
Telluride, sphalerite group
Specific gravity: 8.10
Hardness: 2½
Streak: Black
Colour: Iron black tending toward grey
Environments

Hydrothermal environments

Coloradoite is a rare mercury telluride typically found as inclusions in gold and associated with other tellurides, in hydrothermal tellurium-bearing precious metal veins (HOM, MW). Associated minerals include altaite, calaverite, krennerite, petzite, gold, pyrite, chalcopyrite, sphalerite, galena, pyrrhotite and tetrahedritetennantite (HOM).

Localities

At the Golden Mile deposit, Kalgoorlie-Boulder, Western Australia, coloradoite is the most common telluride, frequently intergrown with calaverite, petzite and gold, and occasionally with chalcopyrite and tetrahedrite (AJM 18.1.12-13). It has been reported as small chips with attached petzite and krennerite (AM 34.363-364).

At the Kirkland Lake Mine, Lake Shore Mine, Kirkland Lake Township, Timiskaming District, Ontario, Canada, coloradoite has been found as small compact masses embedded in coarsely crystalline calcite and associated with hessite, chalcopyrite and tetrahedrite (AM 34.363-364).

At the Lake Shore Mine, Kirkland Lake Township, Timiskaming District, Ontario, Canada, coloradoite has been found as compact masses associated with altaite (AM 34.363-364).

At the Toburn Mine, Kirkland Lake Township, Timiskaming District, Ontario, Canada, coloradoite has been found associated with altaite, pyrite and chalcopyrite in quartz stringers in syenite porphyry (AM 34.363-364).

At the Wright Hargreaves Mine, Kirkland Lake Township, Timiskaming District, Ontario, Canada, coloradoite has been found as compact masses with gold, embedded in quartz (AM 34.363-364).

At the Bidgood mine, Lebel Township, Timiskaming District, Ontario, Canada, coloradoite has been found as compact masses of exceptional size associated with calaverite, altaite, gold and molybdenite in brecciated quartz (AM 34.363-364).

At the Hollinger Mine, Tisdale Township, Porcupine mining district, Timmins area, Cochrane District, Ontario, Canada, coloradoite has been found as several fragments of coarsely crystalline calcite with films of hessite, coloradoite, tetrahedrite and chalcopyrite (AM 34.363-364).

At the Deepford Brook, Clarbeston, Pembrokeshire, Wales, UK, a sample taken from just above the confluence of the Deepford Brook with the Afon Syfni was found to contain gold with inclusions of the tellurides coloradoite and petzite, together with pyrite and pyrrhotite (MW).

There are three co-type localities, all in Boulder county, Colorado, USA. The Smuggler Mine is in the Balarat Mining District, and the Keystone Mine and Mountain Lio mines are in the Magnolia Mining District.

At the Cresson Mine, Eclipse Gulch, Cripple Creek Mining District, Teller county, Colorado, USA, coloradoite occurs intergrown with galena and krennerite and associated with acanthite and jarosite (Minrec 36.2.167).

At the Moon Anchor Mine, Cripple Creek Mining District, Teller Co., Colorado, USA, coloradoite occurs with native mercury (Minrec 36.2.167).

Common impurities: Pb

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