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Roubaultite

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Formula:
Cu2(UO2)3(OH)10 · 5H2O
System:
Triclinic
Colour:
Grass green to apple ...
Hardness:
3
Name:
Named after French geologist Professor Marcel Roubault (1905-1974).
This page provides mineralogical data about Roubaultite.

Classification of Roubaultite

Approved 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
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Type Occurrence of Roubaultite

Place of Conservation of Type Material:
Collection of École nationale supérieure des Mines de Paris
Year of Discovery:
1970
Geological Setting of Type Material:
Oxidation zone at the Shinkolobwe Uranium deposit.

Physical Properties of Roubaultite

Colour:
Grass green to apple green
Hardness (Mohs):
3
Cleavage:
Perfect
Perfect on {100} and imperfect on {010}
Density:
5.02 g/cm3 (Calculated)

Crystallography of Roubaultite

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 7.73Å, b = 6.87Å, c = 10.87Å
α = 86.48°, β = 134.2°, γ = 93.17°
Ratio:
a:b:c = 1.125 : 1 : 1.582
Morphology:
Rosette-like aggregates consisting of platy (on (100)) crystals.
Comment:
Or P-1
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.74 (9)
6.88 (8)
5.55 (IO)
3.448 (8)
3.226 (8)
3.175 (8)

Optical Data of Roubaultite

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 Roubaultite

Formula:
Cu2(UO2)3(OH)10 · 5H2O
Essential elements:
All elements listed in formula:
Analytical Data:
CuO (13.5)
SeO (0.3)
U03 (71.6)
H20 (14.8)
sum = 100.2 Wt %

Relationship of Roubaultite to other Species

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2O
5.EA.15WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2O
5.EA.20Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2O
5.EA.30Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2O
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
7.16.1UraniniteUO2
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2O
7.16.3ParaschoepiteUO3 · 2H2O
7.16.4MetaschoepiteUO3 · 1-2H2O
7.16.5MetastudtiteUO4 · 2H2O
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2O
7.16.7IanthiniteU4+(UO2)5O7 · 10H2O
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
7.16.9VandenbrandeiteCu(UO2)(OH)4
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2O
7.16.12RameauiteK2Ca(UO2)6(OH)16 · H2O
7.16.13AgrinieriteK2(Ca,Sr)(UO2)3O3(OH)2·5H2O
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2O
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
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)2
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2O
7.16.25RichetitePb(UO2)4O5 · 4H2O
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2O
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2O
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2O
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2O
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
7.16.33UranosphaeriteBi(UO2)O2(OH)

Other Names for Roubaultite

Name in Other Languages:
German:Roubaultit
Russian:Рубоит
Spanish:Roubaultita

Other Information

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 Roubaultite

Reference List:
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 Roubaultite

Localities for Roubaultite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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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