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Mineralpedia Details for Demesmaekerite

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Demesmaekerite

Demesmaekerite

Named to honor Gaston Demesmaeker, a Belgian mining geologist and Director of the Geological Department at the Union Miniere du Haut Katanga. Demedmaekerite is a rare mineral that occurs in loxidized selenium-bearing copper-cobalt deposits. It can be found at its type locality in the Musonoi mine near Kolwezi in the Katanga Copper Crescent in the Democratic Republic of the Congo, and at Zalesi in Moravia in the Czech Republic. Demesmaekerite is fairly radioactive.

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

Formula
Pb2Cu5(UO2)2(Se4+O3)6(OH)6ยท2H2
Crystal System
Triclinic 
Crystal Habit
Aggregates 
Cleavage
None, None, None 
Color
brown, brownish green, green, bottle green 
Class
Triclinic - Pinacoidal 
Hardness
3-4 
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Demesmaekerite from Musonoi mine, Kolwezi, Shaba Cu belt, Democratic Republic of Congo

Demesmaekerite
            from Musonoi mine, Kolwezi, Shaba Cu belt, Democratic Republic of Congo

Olive green, opaque platy crystals lining a 1cm long vug. Two locality mineral.

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