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Umohoite

A valid IMA mineral species - grandfathered
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This page provides mineralogical data about Umohoite.


Unique Identifiers

IMA Formula:
(UO2)(MoO4) · 2H2O
Type description reference:
Brophy, G.P., Kerr, P.F. (1953) Hydrous uranium molybdate in Maryvale ore. in Annual Report for June 30, 1952 to April 1, 1953 RME-3046, U.S. Atomic Energy Commission: 45-51.

Classification of Umohoite

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
C : With additional cations; with mainly UO2(O,OH)6 hexagonal polyhedra

Dana 8th ed.:
49.2.2.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
2 : Hydrated Normal Molybdates and Tungstates
Hey's CIM Ref.:
27.3.8

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

Mineral Symbols
Transparency:
Opaque
Colour:
Black, blue-black, dark green
Hardness:
2 onMohs scale
Cleavage:
Perfect
Perfect on {001}
Density:
4.53 - 4.66 g/cm3 (Measured)    4.49(3) g/cm3 (Calculated)

Optical Data of Umohoite
Surface Relief:
Moderate
Dispersion:
weak r>v
Pleochroism:
Visible
Comments:
X= dark blue
Y= pale blue
Z= olive-green

Chemistry of Umohoite

Crystallography of Umohoite
General Appearance of Type Material:
Small flat black flakes with triangular markings, in veinlets, and in disseminated grains.
Place of Conservation of Type Material:
No designated type material.
Associated Minerals at Type Locality:
FluoriteIlsemanniteJordisitePyriteQuartz
Uraninite
Reference:
Brophy, G.P., Kerr, P.F. (1953) Hydrous uranium molybdate in Maryvale ore. in Annual Report for June 30, 1952 to April 1, 1953 RME-3046, U.S. Atomic Energy Commission: 45-51.

Other Language Names for Umohoite

Common AssociatesOrth.mmm(2/m2/m2/m) :Pbcn4.GC.05Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2OTrig.3m(32/m) :R3m4.GC.15SpriggitePb3(UO2)6O8(OH)2 · 3H2OMon. 2/m :B2/b

Radioactivityshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

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  • Raman and XRD data at RRUFF project
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    • References for UmohoiteⓘShinkolobwe Mine304 [286-287].+2 other references
    Egypt
     
    Bisher (2012)
    France
     
    - (1998)[MinRec 25:209+2 other referencesHenriot et al. (1998)
    Germany
     
    Desor (08/2020)Rée et al. (1974)
    Indonesia
     
    Setiawan I et al. (2014)
    Kazakhstan
     
    Pekov (1998)+1 other reference
    Romania
     
    Szakáll (2002)Szakáll (2002)
    Slovakia
     
    Števko M. (2022)
    USA
     
    Anthony et al. (1995)Bollin & Kerr (1958)+3 other referencesNorthrop et al. (1996)+1 other referenceSmith (1991)Bomber et al. (1986)Nikischer (2024)- (2005)Page et al. (1956)+2 other referencesBullock (1981)Brophy et al. (1953)+1 other reference- (2005)- (2005)Krivovichev et al. (2000)
    Quick NavTopAbout UmohoiteUnique IdentifiersIMA ClassificationClassificationMineral SymbolsPhysical PropertiesOptical DataChemistryCrystallographyCrystal StructureX-Ray Powder DiffractionGeological EnvironmentType OccurrenceOther LanguagesCommon AssociatesStrunz-MindatRadioactivityOther InformationInternet LinksReferencesLocalitiesLocality List
     
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