calaverite

[kə′lav·ə‚rīt]

(mineralogy)

AuTe₂ A yellowish or tin-white, monoclinic mineral commonly containing gold telluride and minor amounts of silver.

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Quartz (including chalcedony), dolomite and celestine were present, and the chamber lining contained a chalk-like, whitish material with abundant celestine, slightly altered calaverite and native gold.

Stage II includes deposition of milky to smoky quartz, pale purple fluorite, fine-grained pyrite, specular hematite, dolomite or ankerite, celestine, barite, roscoelite, sphalerite, galena, tetrahedrite, calaverite, krennerite, sylvanite, petzite, hessite, and native gold.

Calaverite is the most common telluride in the district, occurring as a late middle-stage vein mineral (Loughlin and Koschmann, 1935; Thompson et al.

It preceded and overlapped the occurrence of calaverite at the Cresson mine (Saunders, 1988).

As small, often mammillary yellowish green masses, emmonsite occurs with native gold, tellurite and partially oxidized calaverite (Lindgren and Ransome, 1906; Eckel, 1997).

Gold is uncommon as large grains, spongy masses, thin sheets, plates and grooved pseudomorphs after calaverite and other tellurides.

Hessite occurs as an early-stage mineral in microscopic, interstitial grains in calaverite in the Portland mine, where rich pyritic ore was shattered and recemented by tellurides, quartz and fluorite (Loughlin and Koschmann, 1935; Eckel, 1997).

It may be intimately intergrown with calaverite (in parallel growth) and embedded in celestine or a "kaolin-like" material on pyritic quartz gangue (Lindgren and Ransome, 1906; Chester, 1898; Loughlin and Koschmann, 1935; Eckel, 1997).

Melonite was found on the 2100, 2200 and 2300 levels of the Cresson mine, where it occurred as probable pseudomorphs after calaverite.

At the Mary McKinney mine, massive roscoelite occurred with quartz, fluorite and calaverite.

Famous mineral localities: the Cripple Creek mining district Colorado

A number of rare telluride minerals have also been available from the Fersman Museum, and include rich, nearly pure, massive black coloradoite specimens (sometimes to over 1 kg) associated with massive hessite, petzite, and occasional calaverite from Kochbulak, Uzbekistan.

World review of mineral discoveries: 1993-1994

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