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Mineralpedia Details for Dumontite

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Dumontite

Dumontite

Named after Belgian geologist Andre Hubert Dumont. Dumontite is a rare mineral that occurs in the Democratic Republic of the Congo, the United States, Australia, as well as at newer localities in Italy, France, Germany, Austria, Slovenia, and Tajikistan. It occurs in pockets of tobernite in oxidized uranium deposits at its type locality in the Shinkolobwe mine in the Democratic Republic of the Congo. Dumontite can fluoresce pale green under ultraviolet light and is quite radioactive.

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

Formula
Pb2(UO2)3(PO4)2O2ยท5H2
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Color
golden yellow, light yellow 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Hardness
2-3 
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Dumontite from Musonoi mine, Kolwezi, Shaba Cu belt, Democratic Republic of Congo

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

Bright yellow-orange rosettes to 0.1mm composed of platy crystals on Torbernite.

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