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Mineralpedia Details for Arthurite

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Arthurite

Arthurite

Named to honor Sir Arthur Edward Ian Montagu Russell and Arthur William Gerald Kingsbury, for their contributions to British mineralogy. Arthurite is a rare mineral that occurs in oxidized copper deposits and forms as a result of the alteration of arsenopyrite or enargite. Localities for Arthurite include in England, Germany, Portugal, Spain, Chile, the United States, and Australia among a few others.

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

Formula
CuFe3+2(AsO4)2(OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Acicular, Spherical 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
apple green, emerald green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3-4 
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Arthurite from Majuba Hill mine, Pershing Co., Nevada, United States

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

Bright to dark green, compact radial tufts of Arthurite to 1mm. The radial nature of the crystal aggregates is demonstrated in the lower left.

Rich grass green tufts of Arthurite to 1mm composed of prismatic crystals in tight radial sprays associated with prismatic, glassy Olivenite crystals.

Click thumbnail images for larger view.

Arthurite from Calstock, Cornwall, England

Arthurite
            from Calstock, Cornwall, England

Grass green patches of Arthurite composed of very micro acicular sprays.

Click thumbnail images for larger view.

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