Demesmaekerite (original) (raw)

A valid IMA mineral species

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About DemesmaekeriteHide

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Formula:

Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O

Colour:

Bottle-green when fresh, turning somewhat brownish on dehydration

Name:

Named in 1965 by Fabian Cesbron, B. Bachet, and Robert Oosterbosch in honour of Gaston Demesmaeker [5 March 1911, Halle, Belgium – 13 February 1997, Anderlecht, Belgium], Belgian geologist, former director of the Union Minière du Haut Katanga (UMHK).

This page provides mineralogical data about Demesmaekerite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1259:7

cbc6811d-f719-4759-ab0a-89bbbd051cbb

IMA Classification of DemesmaekeriteHide

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IMA Formula:

Pb2Cu5(UO2)2(Se4+O3)6(OH)6 · 2H2O

Type description reference:

Classification of DemesmaekeriteHide

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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

34.7.6.1

34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen

28.1.10

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol Source Reference
Dmm IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DemesmaekeriteHide

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Transparency:

Translucent, Opaque

Colour:

Bottle-green when fresh, turning somewhat brownish on dehydration

Density:

5.28(4) g/cm3 (Measured) 5.45 g/cm3 (Calculated)

Optical Data of DemesmaekeriteHide

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RI values:

_n_α = 1.835 _n_γ = 1.910

δ = 0.075

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

X' = yellow-green; Y' = brown.

Chemistry of DemesmaekeriteHide

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Mindat Formula:

Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O

Crystallography of DemesmaekeriteHide

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Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 11.94 Å, b = 10.02 Å, c = 5.62 Å
α = 90°, β = 100°, γ = 91.91°

Ratio:

a:b:c = 1.192 : 1 : 0.561

Unit Cell V:

661.78 ų (Calculated from Unit Cell)

Morphology:

Elongated [100] and flattened (100). Dominant faces are (100} and {010}; ten other forms were noted in type material.

Crystal StructureHide

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ID Species Reference Link Year Locality Pressure (GPa) Temp (K)
0009977 Demesmaekerite Ginderow D, Cesbron F (1983) Structure de la demesmaekerite,Pb2Cu5(SeO3)6(UO2)2(OH)6*2H2O Acta Crystallographica C39 824-827 1983 Musoni, Kolwezi, Shaba, Zaire 0 293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
2.97 Å (FFF)
5.42 Å (FF)
5.89 Å (F)
3.34 Å (F)
5.14 Å (mF)
4.72 Å (mF)
4.67 Å (mF)

Geological EnvironmentHide

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Type Occurrence of DemesmaekeriteHide

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Place of Conservation of Type Material:

Université de Paris.
Musée de Minéralogie, Ecole des Mines de Paris.
Muséum national d'Histoire naturelle, Paris.
National History Museum, London.

Associated Minerals at Type Locality:

Reference:

Cesbron, F., Bachet, B., Oosterbosch, R. (1965) La demesmaekerite, sélénite hydraté d'uranium, cuivre et plomb. Bulletin de la Société Française de Minéralogie et de Cristallographie: 88: 422-425.

Synonyms of DemesmaekeriteHide

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Other Language Names for DemesmaekeriteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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4.JJ. Petermegawite Al6(Se4+O3)3[SiO3(OH)](OH)9 · 10H2O Orth. m _m_2 : C m _c_21
4.JJ. Borzęckiite Pb(UO2)3(SeO3)2O2 · 3H2O Orth. m _m_2
4.JJ.05 Marthozite Cu2+(UO2)3(SeO3)2O2 · 8H2O Orth. m _m_2
4.JJ.10 Guilleminite Ba(UO2)3(SeO3)2O2 · 3H2O Orth. m _m_2 : P m _n_21
4.JJ.15 Piretite Ca(UO2)3(SeO3)2(OH)4 · 4H2O Orth.
4.JJ.25 Haynesite (UO2)3(OH)2(SeO3)2 · 5H2O Orth.
4.JJ.30 Favreauite PbBiCu6O4(SeO3)4(OH) · H2O Tet. 4/m : _P_4/n

Other InformationHide

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Health Risks:

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

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References for DemesmaekeriteHide

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Reference List:

Gurzhiy, V.V., Izatulina, A.R., Krzhizhanovskaya, M.G., Murashko, M.N., Dar’ya, V.S., Shilovskikh, V.V., Krivovichev, S.V. (2020) Thermal behavior of uranyl selenite minerals derriksite and demesmaekerite. Journal of Geosciences: 65(4): 249-259.

Localities for DemesmaekeriteHide

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This 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.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Czech Republic
Olomouc Region Jeseník District Javorník Zálesí ⓘ Zálesí uranium deposit Pauliš et al. (2006) +2 other references
DR Congo (TL)
Lualaba Mutshatsha Kolwezi ⓘ Musonoi Mine (TL) Cesbron et al. (1965) +2 other references
Spain
Catalonia Lleida Pallars Jussà La Vall Fosca La Torre de Cabdella Castell-estaó ⓘ Eureka mine Castillo-Oliver et al. (2019)