Category Oxide mineral Crystal system Triclinic | Strunz classification 4.JJ.20 Space group P1 | |
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Formula(repeating unit) Pb2Cu5(UO2)2(SeO3)6(OH)6•2H2O Crystal class Pinacoidal (1)(same H-M symbol) | ||
Demesmaekerite is an uranium mineral with the chemical formula: Pb2Cu5(UO2)2(SeO3)6(OH)6•2H2O.
It is named after the Belgian mineralogist, who worked at the Musonoi Mine, Gaston Demesmaeker (born 1911). It is a secondary mineral which contains lead, copper and (the rarer in minerals) selenium, it is a bottle green to brown/yellow colour, its crystal habit changes from one form to another form depending on where it is found. It has a Mohs hardness of about 2-3.
It can be found alongside other very rare selenium-bearing uranium ores, such as haynesite, guilleminite, marthozite and piretite.
References
Demesmaekerite Wikipedia(Text) CC BY-SA