Uranotungstite
A valid IMA mineral species
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About Uranotungstite
Formula:
(Ba0.35Pb0.27)Σ0.62[(U6+O2)2(W6+0.98Fe3+0.26◻0.75)O4.7(OH)2.5(H2O)1.75](H2O)1.67
Formular originally assumed to be (Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2O (Walenta, 1985).
Colour:
Yellow, orange, brown, blackish
Lustre:
Pearly, Dull
Hardness:
2
Specific Gravity:
>4.03
Crystal System:
Monoclinic
Name:
The name reflects its composition: Uranium and Tungsten.
Originally assumed to be orthorhombic and having the chemical formula (Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2O (Walenta, 1985). A restudy of type material and other material, including a crystal-structure determination, showed the mineral to be in fact monoclinic, with space group P21/m, and to have a fairly different formula (Steciuk et al., 2022).
Unique combination of elements (status: 2023); the first mineral with species-defining Ba & W (compare ronpetersonite).
Unique combination of elements (status: 2023); the first mineral with species-defining Ba & W (compare ronpetersonite).
Unique Identifiers
Mindat ID:
4115
Long-form identifier:
mindat:1:1:4115:3
GUID
(UUID V4):
(UUID V4):
33a84997-ae2d-490a-beeb-396515ba1668
IMA Classification of Uranotungstite
Approved
IMA Formula:
Ba(UO2)2W2O8(OH)2 · H2O
Approval year:
1984
First published:
1985
Classification of Uranotungstite
7.HB.25
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
49.3.5.1
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
27.4.12
27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates
27 : Sulphites, Chromates, Molybdates and Tungstates
4 : Tungstates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Utgs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Uranotungstite
Pearly, Dull
Transparency:
Translucent
Colour:
Yellow, orange, brown, blackish
Streak:
Yellow
Hardness:
2 on Mohs scale
Cleavage:
Perfect
{010}
{010}
Fracture:
Irregular/Uneven
Density:
>4.03 g/cm3 (Measured) 4.27 g/cm3 (Calculated)
Optical Data of Uranotungstite
Type:
Biaxial (-)
RI values:
nα = 1.682(5) nβ = 1.845(5) nγ = 1.855(5)
2V:
Measured: 42° , Calculated: 24°
Max Birefringence:
δ = 0.173
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v moderate
Pleochroism:
Visible
Comments:
X = nearly colorless, Y = Z = yellow
Comments:
X = b
Chemistry of Uranotungstite
Mindat Formula:
(Ba0.35Pb0.27)Σ0.62[(U6+O2)2(W6+0.98Fe3+0.26◻0.75)O4.7(OH)2.5(H2O)1.75](H2O)1.67
Formular originally assumed to be (Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2O (Walenta, 1985).
Formular originally assumed to be (Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4 · 12H2O (Walenta, 1985).
Crystallography of Uranotungstite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 6.318(5) Å, b = 7.388(9) Å, c = 13.71(4) Å
β = 99.04(13)°
β = 99.04(13)°
Ratio:
a:b:c = 0.855 : 1 : 1.856
Unit Cell V:
632.00 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular, lath-shaped (pseudo-orthorhombic).
Twinning:
Pervasive, parallel to the platey face (Kolitsch and Plášil, unpublished data).
Comment:
Originally assumed to be orthorhombic, with a = 9.22, b = 13.81, c = 7.17 Å (Walenta, 1985).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.96 Å | (10) |
| 4.60 Å | (6) |
| 3.46 Å | (5) |
| 3.21 Å | (7) |
| 3.01 Å | (3) |
| 2.77 Å | (4) |
| 1.970 Å | (4) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Uranotungstite
Co-Type Localities:
General Appearance of Type Material:
Spherulitic aggregates up to 0.3 mm in diameter.
Place of Conservation of Type Material:
University of Stuttgart, Stuttgart, Germany.
Associated Minerals at Type Locality:
Reference:
Walenta, K. (1985): Uranotungstit, ein neues sekundäres Uranmineral aus dem Schwarzwald. Tschermaks Mineralogische und Petrographische Mitteilungen: 34, 25-34.
Synonyms of Uranotungstite
Other Language Names for Uranotungstite
German:Uranotungstit
Spanish:Uranotungstita
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Uranotungstite associated with Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| 3 photos of Uranotungstite associated with Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| 2 photos of Uranotungstite associated with Gearksutite | Ca[Al(F,OH)5(H2O)] |
| 2 photos of Uranotungstite associated with Tyuyamunite | Ca(UO2)2(VO4)2 · 5-8H2O |
| 2 photos of Uranotungstite associated with Nováčekite | Mg(UO2)2(AsO4)2 · 10H2O |
| 1 photo of Uranotungstite associated with Prosopite | CaAl2F4[(OH)4-xFx] |
| 1 photo of Uranotungstite associated with Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| 1 photo of Uranotungstite associated with Fluorite | CaF2 |
Related Minerals - Strunz-mindat Grouping
| 7.HB.15 | Calcurmolite | Ca[(UO2)3(MoO4)2(OH)4](H2O)~5.0 |
| 7.HB.20 | Tengchongite | Ca(UO2)6(MoO4OH)2O2(OH)4 · 9H2O |
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.
Internet Links for Uranotungstite
mindat.org URL:
https://www.mindat.org/min-4115.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Uranotungstite
Localities for Uranotungstite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
France | |
| Cuchet et al. (2000) |
| Georges FAVREAU collection & EDX ... |
Germany (TL) | |
| Walenta (1985) +2 other references |
| Walenta (1985) +1 other reference |
Namibia | |
| Schnaitmann et al. (2007) |
| von Bezing (2007) |
Russia | |
| Alekseev et al. (2015) |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany