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Yttrotungstite-(Ce)
A valid IMA mineral species
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About Yttrotungstite-(Ce)
Formula:
CeW2O7(OH) · H2O
Colour:
Orange-yellow
Hardness:
1
Specific Gravity:
6.23 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after its chemical composition containing yttrium and tungsten.
See also Yttrotungstite-(Y) and Yttrotungstite-(Nd).
A rare secondary mineral occurring in the oxidised zones of tungsten deposits.
A rare secondary mineral occurring in the oxidised zones of tungsten deposits.
Unique Identifiers
Mindat ID:
7380
Long-form identifier:
mindat:1:1:7380:2
Similar Names
| Hydrotungstite | A valid IMA mineral species - grandfathered | WO3 · 2H2O |
| Yttrotungstite-(Nd) | A valid IMA mineral species | NdW2O7(OH) · H2O |
| Yttrotungstite-(Y) | A valid IMA mineral species - grandfathered | YW2O7(OH) · H2O |
IMA Classification of Yttrotungstite-(Ce)
Approved
IMA Formula:
Ce3+W6+2O6(OH)3
Classification of Yttrotungstite-(Ce)
4.FD.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
49.3.3.1
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
27.4.7
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 for Standard |
|---|---|---|
| Ytgs-Ce | 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 Yttrotungstite-(Ce)
Colour:
Orange-yellow
Hardness:
1 on Mohs scale
Cleavage:
Perfect
On {100}, perfect.
On {100}, perfect.
Density:
6.23 g/cm3 (Calculated)
Comment:
Measured density not determined.
Optical Data of Yttrotungstite-(Ce)
Type:
Biaxial
RI values:
nα = 1.89 nβ = 1.95 nγ = 2.02
Max. Birefringence:
δ = 0.130
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Dispersion:
r > v strong
Chemistry of Yttrotungstite-(Ce)
Mindat Formula:
CeW2O7(OH) · H2O
Element Weights:
Elements listed:
Crystallography of Yttrotungstite-(Ce)
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Cell Parameters:
a = 5.874 Å, b = 8.7 Å, c = 7.07 Å
β = 105.45°
β = 105.45°
Ratio:
a:b:c = 0.675 : 1 : 0.813
Unit Cell V:
348.25 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals bladed, with forms {001}, {101}, {100}, {011}, and {110}; as parallel platy and radiating groups.
Twinning:
On {001}.
Comment:
Class either 2 or 2m; Space Group either P21 or P21/m.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.83 Å | (36) |
| 3.405 Å | (100) |
| 3.337 Å | (18) |
| 2.627 Å | (17) |
| 2.273 Å | (52) |
| 1.767 Å | (21) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Yttrotungstite-(Ce)
Co-Type Localities:
General Appearance of Type Material:
radiated groups of orange yellow bladed crystals.
Place of Conservation of Type Material:
University of Helsinki, Helsinki, Finland.
Associated Minerals at Type Locality:
Synonyms of Yttrotungstite-(Ce)
Other Language Names for Yttrotungstite-(Ce)
Relationship of Yttrotungstite-(Ce) to other Species
Member of:
Other Members of Yttrotungstite Group:
| Yttrotungstite-(Nd) | NdW2O7(OH) · H2O | Mon. 2/m : P21/m |
| Yttrotungstite-(Y) | YW2O7(OH) · H2O | Mon. 2/m : P21/m |
Related Minerals - Strunz-mindat Grouping
| 4.FD.05 | Spertiniite | Cu(OH)2 |
| 4.FD.10 | Diaspore | AlO(OH) |
| 4.FD.10 | Goethite | Fe3+O(OH) |
| 4.FD.10 | Montroseite | (V3+,Fe3+)O(OH) |
| 4.FD.10 | Tsumgallite | GaO(OH) |
| 4.FD.10 | Groutite | Mn3+O(OH) |
| 4.FD.10 | Bracewellite | CrO(OH) |
| 4.FD.10 | Guyanaite | CrO(OH) |
| 4.FD.15 | Manganite | Mn3+O(OH) |
| 4.FD.20 | Yttrotungstite-(Y) | YW2O7(OH) · H2O |
| 4.FD.25 | Frankhawthorneite | Cu2Te6+O4(OH)2 |
| 4.FD.30 | 'Khinite-3T' | Pb2+Cu2+3Te6+O6(OH)2 |
| 4.FD.30 | Housleyite | Pb6CuTe6+4O18(OH)2 |
| 4.FD.30 | Khinite | Pb2+Cu2+3[Te6+O6](OH)2 |
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 Yttrotungstite-(Ce)
mindat.org URL:
https://www.mindat.org/min-7380.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Yttrotungstite-(Ce)
Reference List:
Scrivenor, J.B.; Shenton, J.C. (1927) Thorotungstite. A mineral containing tungsten and thorium from the Federated Malay States. American Journal of Science, S5-13 (78). doi:10.2475/ajs.s5-13.78.487
Beard, E. H. (1950) Thorotungstite - A Misnomer. Colonial Geology and Mineral Resources, 1 (1) 50-51
Sahama, Th.G., v. Knorring, O., Lehtinen, M. (1970) Cerotungstite, a cerian analogue to yttrotungstite, from Uganda. Bulletin of the Geological Society of Finland, 42. 223-228 doi:10.17741/bgsf/42.018(as Cerotungstite)
Fleischer, Michael (1972) New Mineral Names. American Mineralogist, 57 (9-10) 1552-1561 pp.1558-1559
Localities for Yttrotungstite-(Ce)
Showing 6 localities.
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.
Malaysia (TL) | |
| Scrivenor et al. (1927) +2 other references |
Rwanda | |
| J. W. Anthony et al.: "Handbook of Mineralogy" (1997) |
| Dewaele et al. (2016) +1 other reference |
Uganda | |
| J. W. Anthony et al.: "Handbook of Mineralogy" (1997) |
| J. W. Anthony et al.: "Handbook of Mineralogy" (1997) |
| v. Knorring et al. (1972) |
Quick NavTopAbout Yttrotungstite-(Ce)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsStrunz-MindatOther InformationInternet Links References Localities Locality List
Nyamulilo Mine, Kabale, Western Region, Uganda