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Cousinite

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Formula:
MgU
 
2
Mo
 
2
O
 
11
· 6H
 
2
O


Possibly a "Mg-Umohoite". Reinvestigation by modern methods needed.

Davison (1954) describes also an uran molybdate of Mg as monoclinic / pseudo-orthorombic with a = 6.37, b = 33.46, c = 15.0 A and beta = 90°. This mineral is listed in the recent compilation of unnamed species (Smith & Nickel, 2007) as UM1954-// - MoO-MgU.

Classification of Cousinite

IMA status:Questionable/Doubtful
Explanation of status:Fleischer's comment in the American Mineralogist in the New Minerals section: "No physical properties or x-ray data are given, nor is the origin of the name stated. Discussion.-Insufficient data. Compare with moluranite, Am. Mineral. 43, 380 (1958)."
Possibly a "Mg-Umohoite".
Nickel-Strunz 10th (pending) edition ID:7.HA.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
A : With U4+
Dana 8th edition ID:49.3.2.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
Hey's CIM Ref.:27.3.10

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
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Type Occurrence of Cousinite

Type Locality:Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
Year of Discovery:1958

Chemical Properties of Cousinite

Formula:
MgU
 
2
Mo
 
2
O
 
11
· 6H
 
2
O
Simplified for copy/paste:MgU2Mo2O11·6H2O
Essential elements:H, Mg, Mo, O, U
All elements listed in formula:H, Mg, Mo, O, U
Analytical Data:After deduction of wulfenite impurity.
UO2 (58.10)
MoO3 (27.17)
MgO (4.31)
H2O (10.42) 

Relationship of Cousinite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.HA.05Sedovite
U(MoO
 
4
)
 
2
7.HA.15Moluranite
H
 
4
U
4+
 
(UO
 
2
)
 
3
(MoO
 
4
)
 
7
· 18H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
27.3.1Lindgrenite
Cu
 
3
(MoO
 
4
)
 
2
(OH)
 
2
27.3.2Powellite
Ca(MoO
 
4
)
27.3.3Wulfenite
Pb(MoO
 
4
)
27.3.4Koechlinite
Bi
 
2
MoO
 
6
27.3.5Sedovite
U(MoO
 
4
)
 
2
27.3.6Mourite
UMo
 
5
O
 
12
(OH)
 
10
27.3.7Iriginite
(UO
 
2
)Mo
 
2
O
 
7
· 3H
 
2
O
27.3.8Umohoite
(UO
 
2
)MoO
 
4
· 2H
 
2
O
27.3.9Moluranite
H
 
4
U
4+
 
(UO
 
2
)
 
3
(MoO
 
4
)
 
7
· 18H
 
2
O
27.3.11Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
· nH
 
2
O
27.3.12Tengchongite
CaO · 6UO
 
3
· 2MoO
 
3
· 12H
 
2
O
27.3.13Kamiokite
Fe
 
2
Mo
 
3
O
 
8
27.3.14Ferrimolybdite
Fe
 
2
(MoO
 
4
)
 
3
· nH
 
2
O

Other Names for Cousinite

Other Languages:
German:Cousinit
Spanish:Cousinita

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 Cousinite

Reference List:

- +
G.F. Davidson (1954): in Summary of progress Geol. Surv. G. Gr., p.70

J.F. Vaes (1958): "Cousiniet, een nieuw uraanmineral". Geologie en Mijnbouw
20, 449.

American Mineralogist: 44: 910.

M. Deliens (1975): "Une association de molybdates d'uranium de Shinkolobwe (région du Shaba, République du Zaïre)". Annales de la Société Géologique de Belgique 98, 155-160.

M. Deliens & P. Piret (1976): "Nouvelles sonnées sur une umohoite magnésienne de Shinkolobwe (région du Shaba, République du Zaïre)". Annales de la Société Géologique de Belgique 99, 205-209.

Internet Links for Cousinite

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  • External Links:
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  • Localities for Cousinite

    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
        • Shinkolobwe
    Vaes, J. F. (1959) American Mineralogist: 44: 910.
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