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Mineralpedia Details for Zemannite

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Zemannite

Zemannite

Named after Dr. Josef Zemann, a crystallographer and specialist in tellurium minerals and a Professor of Mineralogy at the Univeristy of Vienna in Vienna, Austria. Found in four localities worldwide according to mindat.org, the Moctezuma mine in Mexico boasts as this mineral’s type locality. This rare mineral is found at Moctezuma as a “secondary mineral in the oxidized zone of a hydrothermal Au-Te deposit.”

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

Formula
Mg0.5ZnFe3+(Te4+O3)3ยท4.5H2
Crystal System
Hexagonal 
Crystal Habit
Hexagonal, Prismatic, Acicular 
Cleavage
None, None, None 
Luster
Vitreous - Adamantine 
Color
light brown, dark brown 
Class
Hexagonal - Dipyramidal 
Hardness
WebMineral
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Zemannite from Moctezuma mine, Moctezuma, Sonora, Mexico

Zemannite
            from Moctezuma mine, Moctezuma, Sonora, Mexico

Amber colored, hexagonal prisms terminated by pyramids to about 0.75mm.

Click thumbnail images for larger view.

Zemannite from Bambollita mine, Moctezuma, Sonora, Mexico

Zemannite
            from Bambollita mine, Moctezuma, Sonora, Mexico

Brown acicular crystals in divergent groups to 1mm.

Click thumbnail images for larger view.

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