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Mineralpedia Details for Mackayite

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Mackayite

Mackayite

Named for John William Mackay who was an Irish-American Comstock Lode mining magnate who made an endowment to the School of Mines at the University of Nevada in the United States. Mackayite is a rare mineral that occurs in oxidized cold-tellurium deposits within an alteration product of tellurium. It can be found in the United States, Mexico, and Chile.

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

Formula
Fe3+Te4+2O5(OH) 
Crystal System
Tetragonal 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
brownish green, yellow green, olive green 
Streak
light green 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
4.5 
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Mackayite from Lone Pine mine, Catron Co., New Mexico, United States

Mackayite
            from Lone Pine mine, Catron Co., New Mexico, United States

Dark green micro crystals to less than 0.5mm filling void.

Click thumbnail images for larger view.

Mackayite from San Miguel mine, Moctezuma, Sonora, Mexico

Mackayite
            from San Miguel mine, Moctezuma, Sonora, Mexico

Glassy green, well-defined crystals to 0.5mm.

Click thumbnail images for larger view.

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