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Formula: Pb2Cu5(UO2)2(Se4+O3)6(OH)6(H2O)2
Selenite, uranyl mineral
Crystal System: Triclinic
Specific gravity: 5.28 measured, 5.45 calculated
Hardness: 3 to 4
Colour: Bottle-green when fresh, turning somewhat brownish on dehydration
RADIOACTIVE
Environments
Localities
At the type locality, the Musonoi Mine, Kolwezi, Kolwezi mining district, Lualaba, DR Congo, demesmaekerite
occurs rarely in the lower oxidised portions of a selenium-bearing
copper–cobalt deposit, associated with
cuprosklodowskite, kasolite,
guilleminite, derriksite,
chalcomenite, malachite and
selenian digenite
(AM 51.1815-1816).
Pseudomorphs of schoepite
after demesmaekerite have been found here
(Lauf2).
Demesmaekerite from the Musonoi mine -
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