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Mineralpedia Details for Tsumcorite

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Tsumcorite

Tsumcorite

Named for The Tsumeb Corporation for their contributions to investigations of the Tsumeb orebody in Namibia, and quite possibly named after the Tsumcorp mine from which Tsumcorite gets its type locality. It is a rare secondary mineral in some arsenic-bearing, hydrothermal, leas-zinc deposits and occurs in the oxidized zones of these deposits. It can be found in a few localities in North America, Europe, and Africa.

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

Formula
PbZn2(AsO4)2ยท2H2
Crystal System
Monoclinic 
Crystal Habit
Radial, Spherical, Encrustations 
Color
yellow brown, reddish brown, lemon 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness
4.5 
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Tsumcorite from Tsumeb mine, Tsumeb, Namibia

Tsumcorite
            from Tsumeb mine, Tsumeb, Namibia

Thousands of mustard yellow, bowtie-like sprays of Tsumcorite. Tsumeb is the standard for this species. These are from the 2nd oxidation zone in the Tsumeb mine.

Also a specimen with well-defined Tsumcorite as singles and clusters gracing the the Wulfenite crystals.

Click thumbnail images for larger view.

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