calaverite


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calaverite

(kəˈlævəˌraɪt)
n
(Minerals) a metallic pale yellow mineral consisting of a telluride of gold in the form of elongated striated crystals. It is a source of gold in Australia and North America. Formula: AuTe2
[C19: named after Calaveras, county in California where it was discovered]
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References in periodicals archive ?
Alt = altaite, Anh = anhydrite, Au = gold, Bn = bornite, Buck = buckhornite, Cv = covellite, Clv = calaverite, Fi = fluid inclusion, Gck = greenockite, Gn = galena, Mo = molybdenite, Ptz = petzite, Py = pyrite, Qtz = quartz, and Tib = tellurobismuthite.
Godolphin's Calaverite (James McDonald) and Ottoman (Sam Clipperton) take their chances in the A$500,000 Sykes Stakes over 1,200 metres earlier on the card.
Coloradoite has been identified in polished sections from the Cardigan West shaft, in grains to 1 mm along quartz boundaries and as inclusions in krennerite (?) and calaverite (?).
Calaverite was tentatively reported but has not been confirmed.
This paper underlines the mineralogical characteristics of these deposits by pyrite presence as the main mineral, either disseminated or as sulphur; the absence of arsenopyrite and the occurrence of a variety of minerals such as gold, silver, lead, bismuth and nickel of the telluride's group: Petzite, Calaverite, Silvanite, Hessite, Bolinskite, Shtiutzite, Melonite, and altaite, as well as the presence of gold of high purity and electrum (Torres et al., 2005; Lopez, 1988; Lopez et al., 1998; Bortnikov et al., 1988).
In Table II, the study of the mineral composition of the ores demonstrated that the finest gold of high purity is present, as well as gold and silver in form of telluride's Calaverite (Au[Te.sub.2]), Silvanite (Au Ag [Te.sub.4]), Petzite (AgAu[Te.sub.2]), Hessite (AgTe), Shtiutzite and Bolinskite (AgBi[Te.sub.2]).
The floor was several feet thick of a white claylike material that proved to be powdery celestine mixed with microscopic calaverite and kaolinite; sacked and shipped it yielded up to $16,000 in gold per ton (at 1914 prices).
At least 120 mineral species have been reported, including fine specimens of calaverite, sylvanite, krennerite, melonite and creedite.
The Cresson mine at Cripple Creek, Teller County, Colorado is renowned both as the source of the world's finest specimens of calaverite and as one of the richest and most rambunctious of the gold mining camps of the American West a century or so ago, but specimen material of any kind from the mine has always been rare.
From the classic Cripple Creek mines, small flat plates of granite or phonolite show gray or golden metallic smears, cleavage sections and little vugs of bright microcrystals of calaverite, syivanite and krennerite; one miniature shows liberal numbers or calaverite crystal blades to 3 mm on off-white drusy quartz.
Calaverite was first mentioned by Cairnes (1911), who referred to Gwillim's "gold telluride" as "telluride, apparently calaverite." The 1900 report of the Minister of Mines quotes from a prospectus from the Engineer Mining Company of Skagway that indicates the presence of tellurides.
Box 2, Victor, CO) has a large new supply of sylvanite and calaverite crystals and masses (to several mm) on typical felsite matrix from the Cresson mine, Cripple Creek,Teller County.