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Roubaultite

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Formula:
Cu
 
2
(UO
 
2
)
 
3
(OH)
 
10
· 5H
 
2
O
System:TriclinicHardness:3
Name:Named after French geologist Pr. Marcel Roubault (1905-1974).
This page provides mineralogical data about Roubaultite.

Classification of Roubaultite

IMA status:Approved 1970
Strunz 8th edition ID:5/F.03-10
Nickel-Strunz 10th (pending) edition ID:5.EA.25

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
A : UO2:CO3 > 1:1
Dana 8th edition ID:16b.7.13.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
Hey's CIM Ref.:7.16.10

7 : Oxides and Hydroxides
16 : Oxides of U
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Type Occurrence of Roubaultite

Type Locality:Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
Year of Discovery:1970

Physical Properties of Roubaultite

Hardness (Mohs):3

Crystallography of Roubaultite

Crystal System:Triclinic
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
Unit Cell Volume:V 412.99 ų (Calculated from Unit Cell)

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°
Maximum Birefringence:δ = 0.120 - 0.140

Chart 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:
Cu
 
2
(UO
 
2
)
 
3
(OH)
 
10
· 5H
 
2
O
Simplified for copy/paste:Cu2(UO2)3(OH)10·5H2O
Essential elements:Cu, H, O, U
All elements listed in formula:Cu, H, O, U

Relationship of Roubaultite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.EA.05UM1997-24-CO:CaCuHU
Ca
 
2
Cu(UO
 
2
)
 
2
(CO
 
3
)
 
2
O
 
3
· 3H
 
2
O
5.EA.10Urancalcarite
Ca(UO
 
2
)
 
3
(CO
 
3
)(OH)
 
6
· 3H
 
2
O
5.EA.15Wyartite
CaU
5+
 
(UO
 
2
)
 
2
(CO
 
3
)O
 
4
(OH) · 7H
 
2
O
5.EA.20Oswaldpeetersite
(UO
 
2
)
 
2
(CO
 
3
)(OH)
 
2
· 4H
 
2
O
5.EA.30Kamotoite-(Y)
Y
 
2
(UO
 
2
)
 
4
(CO
 
3
)
 
3
O
 
4
· 14H
 
2
O
5.EA.35Sharpite
Ca(UO
 
2
)
 
6
(CO
 
3
)
 
5
(OH)
 
4
· 6H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.16.1Uraninite
UO
 
2
7.16.2Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
· 12H
 
2
O
7.16.3Paraschoepite
UO
 
3
· 2H
 
2
O
7.16.4Metaschoepite
UO
 
3
· 1-2H
 
2
O
7.16.5Metastudtite
UO
 
4
· 2H
 
2
O
7.16.6Studtite
[(UO
 
2
)(O
 
2
)(H
 
2
O)
 
2
] · H
 
2
O
7.16.7Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
· 10H
 
2
O
7.16.8Compreignacite
K
 
2
(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 7H
 
2
O
7.16.9Vandenbrandeite
Cu(UO
 
2
)(OH)
 
4
7.16.11Becquerelite
Ca(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 8H
 
2
O
7.16.12Rameauite
K
 
2
Ca(UO
 
2
)
 
6
(OH)
 
16
· H
 
2
O
7.16.13Agrinierite
K
 
2
(Ca,Sr)(UO
 
2
)
 
3
O
 
3
(OH)
 
2
·5H
 
2
O
7.16.14Protasite
Ba(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
7.16.15Billietite
Ba(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 4-8H
 
2
O
7.16.16Bauranoite
Ba(UO
 
2
)
 
2
(OH)
 
6
· 1-2H
 
2
O
7.16.17Metacalciouranoite
(Ca,Ba,Pb,K
 
2
)U
 
2
O
 
7
· 2H
 
2
O
7.16.18Calciouranoite
(Ca,Ba,Pb)U
 
2
O
 
7
· 5H
 
2
O
7.16.19Orthobrannerite
U
4+
 
U
6+
 
Ti
 
4
O
 
12
(OH)
 
2
7.16.20Thorutite
(Th,U,Ca)Ti
 
2
(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
(U
4+
 
,REE,Th,Ca)(Ti,Fe
3+
 
,Nb)
 
2
(O,OH)
 
6
7.16.24Fourmarierite
Pb(UO
 
2
)
 
4
O
 
3
(OH)
 
4
· 4H
 
2
O
7.16.25Richetite
Pb(UO
 
2
)
 
4
O
 
5
· 4H
 
2
O
7.16.26Curite
Pb
 
3
(UO
 
2
)
 
8
O
 
8
(OH)
 
6
· 3H
 
2
O
7.16.27Masuyite
Pb(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
7.16.28Vandendriesscheite
PbU
 
7
O
 
22
· 12H
 
2
O
7.16.29Metavandendriesscheite
PbU
 
7
O
 
22
· nH
 
2
O n < 12
7.16.30Sayrite
Pb
 
2
(UO
 
2
)
 
5
O
 
6
(OH)
 
2
· 4H
 
2
O
7.16.31Wölsendorfite
(Pb,Ca)U
 
2
O
 
7
· 2H
 
2
O
7.16.32Clarkeite
(Na,Ca,Pb)(UO
 
2
)O(OH) · 0-1H
 
2
O
7.16.33Uranosphaerite
Bi(UO
 
2
)O
 
2
(OH)

Other Names for Roubaultite

Synonyms:
IMA1970-030
Other Languages:
German:Roubaultit
Russian:Рубоит
Spanish:Roubaultita

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 Roubaultite

Reference List:

- +
Cesbron F., Pierrot R., et Verbeek T. (1970) - 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.

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

Search Engines:
  • Look for Roubaultite on Google
  • Look for Roubaultite images on Google
  • External Links:
  • Look for Roubaultite on Webmineral
  • Look for Roubaultite on Athena Mineralogy
  • Look for Roubaultite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Roubaultite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Fabre Minerals - search for Roubaultite specimens
  • Buy RARE Minerals from Rocks of Africa
  • Buy rare minerals from Excalibur Minerals
  • Fine Minerals from Weinrich Minerals, Inc.
  • Find Roubaultite on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • Lapis Mineral Magazin
  • Buy from Dave Bunk Minerals
  • Roubaultite specimens for sale - minfind.com
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Fine and rare minerals from mintreasure.com
  • Localities for Roubaultite

    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.
    (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.
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Kolwezi District
          • Kamoto
    Lapis 17(3), 13-40 (1992)
          • Kolwezi
    F. Cesbron, R. Pierrot, T. Verbeek: Bull. Minéral. 93:550-554 (1970)
        • Shinkolobwe
    Bull.Soc.fr.Min.Crist.(1970) 93, 550-554
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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