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Mineralpedia Details for Olivenite

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Olivenite

Olivenite

Named after its common appearance as a mineral that is olive-green in color. Most typically olive green, but also brownish green to yellow green. Short prismatic to acicular crystals, also fibrous (variety leucochalcite), to tabular. It is “the most common secondary copper arsenate in the oxidized zone of hydothermal copper deposits.” Most notable localitiies include Majuba Hill, Nevada; Tsumeb; Tintic district, Utah; Cornwall, England. Other localities include France, Germany, Greece, Morocco, Namibia, and Chile among many others. 

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

Formula
Cu2AsO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Acicular to Prismatic, Radial, Fibrous 
Cleavage
Indistinct, Indistinct, Indistinct 
Luster
Vitreous - Greasy 
Color
olive green, yellowish brown, dirty white, blackish green, liver brown 
Streak
yellowish green 
Geological Setting
In oxidized zone of copper and arsenate rich deposits.  
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
WebMineral
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Mindat
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Olivenite from Gold Hill mine, Tooele Co., Utah, United States

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

Olive green prismatic crystals to 0.5mm in radial sprays throughout matrix.

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Olivenite from Majuba Hill mine, Pershing Co., Nevada, United States

Olivenite
            from Majuba Hill mine, Pershing Co., Nevada, United States

Dark green blocky Olivenite crystals to about 0.5mm with light green edges.

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

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

Olive green acicular crystals to 2mm associated with pastel to darker green somewhat glassy, botryoidal Cornwallite.

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Olivenite from Tsumeb mine, Tsumeb, Namibia

Olivenite
            from Tsumeb mine, Tsumeb, Namibia

Deep green prismatic crystals of Olivenite to 3mm with bright pastel green cuprian Adamite.

Stout emerald green Olivenite crystals, the longest to 8mm but averaging 3mm or so. Associated with bright yellowish green botryoidal Gartrellite.

Deep olive green divergent crystal groups to 8mm. The actual color approaches a deepr, darker green than the photos.

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Olivenite from Wheal Gorland, St. Day dist., Cornwall, England

Olivenite
            from Wheal Gorland, St. Day dist., Cornwall, England

Quartz vugs under 1cm lined with grass green acicular Olivenite.

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