Demesmaekerite

Demesmaekerite is a rare uranium selenite mineral with the chemical formula: Pb2Cu5(UO2)2(SeO3)6(OH)6·2H2O.

Demesmaekerite
A specimen of demesmaekerite associated with blue chalcomenite crystals
General
CategoryOxide mineral
Formula
(repeating unit)
Pb2Cu5(UO2)2(SeO3)6(OH)6·2H2O
IMA symbolDmm[1]
Strunz classification4.JJ.20
Dana classification34.07.06.01
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 11.94 Å, b = 10.02 Å, c = 5.62 Å; α = 90°, β = 100°, γ = 91.91°
Identification
Formula mass2,172.01 gm
ColorGreen to olive green - turns brownish on dehydration
Crystal habitElongated, striated, typically in radial aggregates
CleavageNone
Mohs scale hardness3-4
DiaphaneityTranslucent, opaque
Specific gravity5.28
DensityMeasured 5.28(4), calculated 5.45
Optical propertiesBiaxial (+)
Refractive indexnα = 1.835 nγ = 1.910
PleochroismVisible
DispersionStrong
Other characteristics Radioactive
References[2][3]

It is named after the Belgian mineralogist Gaston Demesmaeker, who worked at the Musonoi Mine in Katanga. It is a secondary mineral which contains lead, copper and selenium, it is a bottle green to brown/yellow color, its crystal habit varies depending on where it is found. It has pleochroic attributes, which means depending on which axis it is seen, the gem displays different colors, which is an optical phenomenon. On the X axis it displays a yellow-green color, and on the Y the gem is seen in a brown color.[2] Demesmaekerite has a very strong radioactivity, 1,629,108.74, measured in GRapi (Gamma Ray American Petroleum Institute Units). It is mostly made out of oxygen (22.1%), uranium (21.92%) which causes its irradiative attributes, selenium (21.81%), lead (19.08%) which is a poisonous chemical element and copper (14.63%), but also contains hydrogen (0.46%).[4]

It can be found associated with other rare selenium-bearing uranium ores, such as haynesite, guilleminite, marthozite and piretite.[3]

References

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