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Mineralpedia Details for Goudeyite

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Goudeyite

Goudeyite

Hatfield Goudey, American economic geologist and mineral collector and dealer, is the namesake of Goudeyite as a contributor to the knowledge of the type locality of the mineral at Majuba Hill mine in Nevada, USA. Goudeyite is a rare mineral that occurs at its type locality in a hydrothermal copper-tin ore within rhyolite porphories and breccias. Other localities for Goudeyite include in Germany, France, and Namibia.

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

Formula
Cu6Al(AsO4)3(OH)6ยท3H2
Crystal System
Hexagonal 
Crystal Habit
Acicular, Hexagonal 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellow green 
Streak
greenish white 
Class
Hexagonal 
Hardness
3-4 
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Goudeyite from Majuba Hill mine, Pershing Co., Nevada, United States

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

Dark grass green coating with Kaolinite.

Green finely acicular to velvet-like Goudeyite withing spongy brown Goethite and Zunerite.

Bright green coating of Goudeyite with excellent coverage contrasting nicely against white Kaolinite on rhyolite matrix.

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