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Roubaultite

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Marcel Edouard Roubault
Formula:
Cu2(UO2)3(CO3)2O2(OH)2•4H2O
Colour:
Grass green to apple green
Hardness:
3
Specific Gravity:
5.02 (Calculated)
Crystal System:
Triclinic
Name:
Named after French geologist Professor Marcel Roubault (1905-1974).
This page provides mineralogical data about Roubaultite.


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Classification of RoubaultiteHide

Approved
Approval Year:
1970
5.EA.25

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
A : UO2:CO3 > 1:1
16b.7.13.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
7.16.10

7 : Oxides and Hydroxides
16 : Oxides of U

Physical Properties of RoubaultiteHide

Colour:
Grass green to apple green
Hardness:
Cleavage:
Perfect
Perfect on {100} and imperfect on {010}
Density:
5.02 g/cm3 (Calculated)

Optical Data of RoubaultiteHide

Type:
Biaxial (+)
RI values:
nα = 1.700 nβ = 1.800 nγ = 1.820 - 1.840
2V:
Measured: 55° , Calculated: 46° to 60°
Max Birefringence:
δ = 0.120 - 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively weak

Chemical Properties of RoubaultiteHide

Formula:
Cu2(UO2)3(CO3)2O2(OH)2•4H2O
IMA Formula:
Cu2O2(UO2)3(CO3)2(OH)2 · 4H2O

Crystallography of RoubaultiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 7.73 Å, b = 6.87 Å, c = 10.87 Å
α = 86.48°, β = 134.2°, γ = 93.17°
Ratio:
a:b:c = 1.125 : 1 : 1.582
Unit Cell V:
412.99 ų (Calculated from Unit Cell)
Morphology:
Rosette-like aggregates consisting of platy (on (100)) crystals.
Comment:
Or P-1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.74 (9)
6.88 (8)
5.55 (IO)
3.448 (8)
3.226 (8)
3.175 (8)

Type Occurrence of RoubaultiteHide

Place of Conservation of Type Material:
Collection of École nationale supérieure des Mines de Paris
Geological Setting of Type Material:
Oxidation zone at the Shinkolobwe Uranium deposit.
Associated Minerals at Type Locality:

Synonyms of RoubaultiteHide

Other Language Names for RoubaultiteHide

German:Roubaultit
Russian:Рубоит
Spanish:Roubaultita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Billietite2 photos of Roubaultite associated with Billietite on mindat.org.
Malachite2 photos of Roubaultite associated with Malachite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2OOrth.
5.EA.15WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2OOrth.
5.EA.20Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2OMon. 2/m : P21/b
5.EA.30Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2OMon. 2/m
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.16.1UraniniteUO2Iso. m3m (4/m 3 2/m) : Fm3m
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
7.16.3ParaschoepiteUO3 · 2H2OOrth.
7.16.4MetaschoepiteUO3 · 1-2H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
7.16.5MetastudtiteUO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2OMon.
7.16.7IanthiniteU4+(UO2)5O7 · 10H2OOrth. mm2 : Amm2
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2OOrth.
7.16.9VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
7.16.12RameauiteK2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)Mon. m : Bb
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OOrth.
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon.
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
7.16.16BauranoiteBa(UO2)2(OH)6 · 1-2H2O
7.16.17Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
7.16.18Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
7.16.19OrthobranneriteU4+U6+Ti4O12(OH)2Orth.
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6Mon.
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig.
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig. 3 : R3
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6Mon. 2/m : B2/m
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2OOrth.
7.16.25Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O Tric.
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth.
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2OMon.
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2OTrig.
7.16.33UranosphaeriteBi(UO2)O2(OH)Mon. 2/m

Other InformationHide

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

References for RoubaultiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cesbron F., Pierrot R., et Verbeek T. (1970): La roubaultite Cu2(UO2)3(OH)10·5H2O, une nouvelle espéce minérale. Bulletin de la Société française de Minéralogie et de Cristallographie. 93, 500-554.
American Mineralogist (1972): 57, 1912.
Ginderow, D. and Cesbron, F. (1985): Structure de la roubaultite Cu2(UO2)3(CO3)2O2(OH)2·4H2O. Acta Crystallographica. 41, 654-657.
American Mineralogist (1986): 71, 1282.
Deliens, Michel (1992): Occurrence de roubaultite à Kamoto (Shaba, Zaïre). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. 58, 295-296
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 RoubaultiteHide

Localities for RoubaultiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Kolwezi District
        • Kamoto
Deliens, Michel (1992): Occurrence de roubaultite à Kamoto (Shaba, Zaïre). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. 58, 295-296.; Lapis 17(3), 13-40 (1992)
        • Kolwezi
Paul De Bondt photo and specimen, photo ID 194233
      • Shinkolobwe
Cesbron F., Pierrot R., et Verbeek T. (1970): La roubaultite Cu2(UO2)3(OH)10·5H2O, une nouvelle espéce minérale. Bulletin de la Société française de Minéralogie et de Cristallographie. 93, 500-554.
Mineral and/or Locality  
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