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Demesmaekerite

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Musonoi Mine, Kolwezi, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
© Stephan Wolfsried

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Formula:
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
 · 2H
 
2
O
System:TriclinicColour:Translucent green
Hardness:3 - 4
Name:After Gaston Demesmaeker (1911-?), Belgian geologist with the Union Minière du Haut Katanga (UMHK).
This page provides mineralogical data about Demesmaekerite.

Classification of Demesmaekerite

IMA status:Approved
Strunz 8th edition ID:4/K.11-40
Nickel-Strunz 10th (pending) edition ID:4.JJ.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
J : Selenites with additional anions, with H2O
Dana 8th edition ID:34.7.6.1

34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
Hey's CIM Ref.:28.1.10

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
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Type Occurrence of Demesmaekerite

Type Locality:Musonoi Mine, Kolwezi, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
Year of Discovery:1965

Physical Properties of Demesmaekerite

Colour:Translucent green
Hardness (Mohs):3 - 4

Crystallography of Demesmaekerite

Crystal System:Triclinic
Cell Parameters:a = 11.94Å, b = 10.02Å, c = 5.62Å
α = 90°, β = 100°, γ = 91.91°
Ratio:a:b:c = 1.192 : 1 : 0.561
Unit Cell Volume:V 661.78 ų (Calculated from Unit Cell)

Optical Data of Demesmaekerite

Type:Biaxial (+)
RI values: nα = 1.835 nγ = 1.910
Maximum Birefringence:δ = 0.075

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:strong

Chemical Properties of Demesmaekerite

Formula:
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
 · 2H
 
2
O
Essential elements:Cu, H, O, Pb, Se, U
All elements listed in formula:Cu, H, O, Pb, Se, U

Relationship of Demesmaekerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JJ.05Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
3
(OH)
 
2
 · 7H
 
2
O
4.JJ.10Guilleminite
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
4.JJ.15Piretite
Ca(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 4H
 
2
O
4.JJ.25Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
 · 5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
28.1.1Chalcomenite
CuSeO
 
3
 · 2H
 
2
O
28.1.2Clinochalcomenite
CuSeO
 
3
 · 2H
 
2
O
28.1.3Francisite
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
28.1.4Sophiite
Zn
 
2
(SeO
 
3
)Cl
 
2
28.1.5Molybdomenite
PbSeO
 
3
28.1.6Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
 · 5H
 
2
O
28.1.7Derriksite
Cu
 
4
(UO
 
2
)(SeO
 
3
)
 
2
(OH)
 
6
 · H
 
2
O
28.1.8Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
3
(OH)
 
2
 · 7H
 
2
O
28.1.9Guilleminite
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
28.1.11Mandarinoite
Fe
3+
2
(SeO
 
3
)
 
3
 · 4H
 
2
O
28.1.12Cobaltomenite
CoSeO
 
3
 · 2H
 
2
O
28.1.13Ahlfeldite
(Ni,Co)SeO
 
3
 · 2H
 
2
O

Other Names for Demesmaekerite

Synonyms:
IMA1965-019
Other Languages:
German:Demesmaekerit
Russian:Демесмэкерит
Spanish:Demesmaekerita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Demesmaekerite

Reference List:

- +
American Mineralogist: 51: 1815.

Ginderow, D. and Cesbron, F. (1983b) Structure de la demesmaekerite, Pb2Cu5(SeO3)6(UO2)2(OH)6·2H2O. Acta Crystallographica: C39: 824-827.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Demesmaekerite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Demesmaekerite details from Handbook of Mineralogy (PDF)
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    • Localities for Demesmaekerite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Olomouc Region
        • Javorník
    		Sejkora J., Škoda R., Pauliš P. 2006: Selenium mineralization of the uranium deposit Zálesí, Rychlebské Hory Mts., Czech Republic. Mineralogia Polonica - Special Papers, vol. 28, 196-198
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Kolwezi
    		Bull.Soc.fr.Min.Crist.(1965) 88, 422-425
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