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Uranotungstite

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Krunkelbach Valley Uranium deposit, Menzenschwand, Black Forest, Baden-Württemberg, Germany
© Stephan Wolfsried

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Formula:
(Fe
2+
 
,Ba,Pb)(UO
 
2
)
 
2
(WO
 
4
)(OH)
 
4
 · 12H
 
2
O
System:OrthorhombicColour:Yellow, orange, brown
Hardness:2
Name:The name reflects its composition: Uranium and Tungsten.


The correct crystal symmetry of uranotungstite appears to be monoclinic, not orthorhombic, space group P21/m (U. Kolitsch, work in progress).

Classification of Uranotungstite

IMA status:Approved 1984
Strunz 8th edition ID:6/G.07-10
Nickel-Strunz 10th (pending) edition ID:7.HB.25

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
Dana 8th edition ID:49.3.5.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
Hey's CIM Ref.:27.4.12

27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates
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Type Occurrence of Uranotungstite

Co-type Localities:Krunkelbach Valley Uranium deposit, Menzenschwand, Black Forest, Baden-Württemberg, Germany
Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1985

Physical Properties of Uranotungstite

Lustre:Pearly, Dull
Diaphaneity (Transparency):Translucent
Colour:Yellow, orange, brown
Hardness (Mohs):2

Crystallography of Uranotungstite

Crystal System:Orthorhombic
Cell Parameters:a = 9.22Å, b = 13.81Å, c = 7.17Å
Ratio:a:b:c = 0.668 : 1 : 0.519
Unit Cell Volume:V 912.94 ų (Calculated from Unit Cell)

Optical Data of Uranotungstite

Type:Biaxial (-)
RI values: nα = 1.682 nβ = 1.845 nγ = 1.855
2V:Measured: 42° , Calculated: 24°
Maximum Birefringence:δ = 0.173

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v moderate

Chemical Properties of Uranotungstite

Formula:
(Fe
2+
 
,Ba,Pb)(UO
 
2
)
 
2
(WO
 
4
)(OH)
 
4
 · 12H
 
2
O
Essential elements:Fe, H, O, U, W
All elements listed in formula:Ba, Fe, H, O, Pb, U, W

Relationship of Uranotungstite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.HB.15Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
 · nH
 
2
O
7.HB.20Tengchongite
CaO · 6UO
 
3
 · 2MoO
 
3
 · 12H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
27.4.1Cuprotungstite
Cu
 
2
(WO
 
4
)(OH)
 
2
27.4.2Scheelite
Ca(WO
 
4
)
27.4.4Anthoinite
AlWO
 
3
(OH)
 
3
27.4.5Mpororoite
Al
 
2
(WO
 
4
)
 
2
O · 6H
 
2
O
27.4.6Yttrotungstite-(Y)
YW
 
2
O
 
6
(OH)
 
3
27.4.7Yttrotungstite-(Ce)
(Ce,Nd,Y)W
 
2
O
 
6
(OH)
 
3
27.4.8Stolzite
Pb(WO
 
4
)
27.4.9Raspite
Pb(WO
 
4
)
27.4.10Russellite
Bi
 
2
WO
 
6
27.4.11Pinalite
Pb
 
3
WO
 
5
Cl
 
2
27.4.13Hübnerite
MnWO
 
4
27.4.14Ferberite
FeWO
 
4
27.4.15Wolframite
(Fe
2+
 
)WO
 
4
 
 
to (Mn
2+
 
)WO
 
4
27.4.16Ferritungstite
27.4.17Phyllotungstite
(H
 
2
O,M)
 
x
(W,Fe)(O,OH)
 
3
 · yH
 
2
O (M = Ca, Cs, Pb or K)
27.4.18Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10

Other Names for Uranotungstite

Synonyms:
IMA1984-005
Other Languages:
German:Uranotungstit
Spanish:Uranotungstita

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 Uranotungstite

Reference List:

- +
Walenta, K. (1985): Uranotungstit, ein neues sekundäres Uranmineral aus dem Schwarzwald. Tschermaks Mineralogische und Petrographische Mitteilungen: 34, 25-34. (in German).

American Mineralogist (1986): 71: 1547.

Internet Links for Uranotungstite

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    • Localities for Uranotungstite

    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.
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    (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.
    France
     
    • Auvergne
      • Allier
        • Ébreuil
          • Échassières
    		Le Règne Minéral, (33), 5-25.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Menzenschwand
    		Tscherm.Min.Petr.Mitt.(1985) 34, 25-34
        • Wolfach
          • Oberwolfach
            • Rankach valley
    		Walenta, K. (1985): Uranotungstit, ein neues sekundäres Uranmineral aus dem Schwarzwald. Tschermaks Mineral. Petrogr. Mitt., 34, 25-34. (in German); Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
    Namibia
     
    • Erongo Region
      • Karibib District
    		Schnaitmann, E. A., Nägele, H., Niedermayr, G., Brandstätter, F. & Jahn, S. (2007): Das Metazeunerit-Pocket auf Tubussis 22, Erongo. Mineralien-Welt 18 (2), 33-43. (in German)
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