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MgU2Mo2O11 · 6H2O
Named in 1958 by J.F. Vaes after Jules Cousin (Comblain-au-Pont, Liège province, Belgium, January 12 1884 - Brussels, November 12 1965) He worked for the Union Minière du Haut-Katanga, in Africa and in Belgium.
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

Approved, 'Grandfathered' (first described prior to 1959), Questionable

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
A : With U4+

3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates

Chemical Properties of Cousinite

MgU2Mo2O11 · 6H2O
IMA Formula:
MgU24+(MoO4)2(OH)6 · 2H2O (?)
Elements listed in formula:
Analytical Data:
After deduction of wulfenite impurity.
UO2 (58.10)
MoO3 (27.17)
MgO (4.31)
H2O (10.42) 

Type Occurrence of Cousinite

Relationship of Cousinite to other Species

7.HA.15MoluraniteH4U4+(UO2)3(MoO4)7 · 18H2O
27.3.7Iriginite(UO2)Mo2O7 · 3H2O
27.3.8Umohoite(UO2)MoO4 · 2H2O
27.3.9MoluraniteH4U4+(UO2)3(MoO4)7 · 18H2O
27.3.11Calcurmolite(Ca,Na)2(UO2)3Mo2(O,OH)11 · nH2O
27.3.12TengchongiteCaO · 6UO3 · 2MoO3 · 12H2O
27.3.14FerrimolybditeFe2(MoO4)3 · nH2O

Other Names for Cousinite

Name in Other Languages:

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 Cousinite

Reference List:
Davidson, G.F. (1954) in Summary of progress Geol. Surv. G. Gr.: 70.

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

Fleischer, M. (1959) New Mineral Names. American Mineralogist: 44: 906-910.

Deliens, M. (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.

Deliens, M., Piret, P. (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 URL:
Please feel free to link to this page.

Localities for Cousinite

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.
(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) (TL)
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
Vaes, J. F. (1959) American Mineralogist: 44: 910.
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