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Mineralpedia Details for Calaverite

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Calaverite

Calaverite

Named for the type locality at the type locality in the Stanislaus mine in Calaveras County in California, USA. Additional localities for this uncommon mineral include others in the USA, Mexico, Chile, Canada, Australia, Japan, Fiji, the Philippines, and Russia, among several others. Generally, Calaverite occurs in low-temperature hydrothermal deposits in veins, although it can occur in hydrothermal deposits of all temperatures. Associated minerals include altaite, coloradoite, krennerite, rickardite, other tellurides, pyrite, arsenopyrite, tetrahedrite, tennantite, sphalerite, stibnite, and other sulfides.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/calaverite.pdf

Formula
AuTe2 
Crystal System
Monoclinic 
Crystal Habit
Striated, Massive, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, yellowish white 
Streak
green 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5 
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Calaverite from Cresson mine, Cripple Creek, Teller Co., Colorado, United States

Calaverite
            from Cresson mine, Cripple Creek, Teller Co., Colorado, United States

Bladed, striated, dark brown Calaverite crystals to 0.5mm on Fluorite.

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Calaverite from Cripple Creek dist., Teller Co., Colorado, United States

Calaverite
            from Cripple Creek dist., Teller Co., Colorado, United States

A rather rich specimen with elongated, striated bleded crystals to 6mm. Very rich specimen with also two appearant octahedrally shapped crystals, which at first glance seems to be orthorhombic which points to the possibility of Krennerite. Although studying these you might conclude they are just odd-shaped or twinned crystals.

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Calaverite from Independence mine, Cripple Creek dist., Teller Co., Colorado, United States

Calaverite
            from Independence mine, Cripple Creek dist., Teller Co., Colorado, United States

Goldish yellow to silvery crystal plates of Calaverite from 5-8mm exposed along a quartz vein of intrusive-volcanic rock.  A good rich specimen with six spots showing nice, lamellar/platy crystals of brittle Calaverite. The Indendence mine, north of Victor,  is located on the southeast edge of Newmont's open pit Cripple Creek mine. 

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