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Mineralpedia Details for Conichalcite

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Conichalcite

Conichalcite

Named after the Greek words konis, meaning “powder,” and chalkos, meaning “copper,” in allusion to the copper in the composition and its occasional appearance as a powdery crust. Relatively uncommon but widespread, conichalcite can be found in many minor occurrences, however good specimens can be found in localities in Spain, England, the United States, Mexico, Chile, and Namibia. Conichalcite occurs as a secondary mineral in oxidized copper deposits as a product of the alteration of enargite.

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

Formula
CaCuAsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Reniform, Massive 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
yellow green, emerald green 
Streak
light green 
Class
Orthorhombic - Disphenoidal 
Fracture
Brittle - Uneven 
Hardness
4.5 
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Conichalcite from Gold Hill mine, Tooele Co., Utah, United States

Conichalcite
            from Gold Hill mine, Tooele Co., Utah, United States

Lime green botryoidal crystals to 3mm across.

Bright translucent green stacked beads of Conichalcite forming tentacle-like growths with Quartz.

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CONICHALCITE from Hilarion mine, Laurium dist., Attika, Greece

CONICHALCITE
            from Hilarion mine, Laurium dist., Attika, Greece
Special Info
Phillips Collection

Colorful rich green botryoidal COnichalcite with a little Azurite.

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Conichalcite from Mina Ojuela, Mapimi, Durango, Mexico

Conichalcite
            from Mina Ojuela, Mapimi, Durango, Mexico

1mm bright, translucent green individual crystals on limonitic matrix.

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Conichalcite from San Rafael mine, Nye Co., Nevada, United States

Conichalcite
            from San Rafael mine, Nye Co., Nevada, United States

Quite an interesting specimen of this mineral with hemispherical clusters to 2mm across composed of acicular crystals. All of the bright green is basically conichalcite.

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