Yttrotungstite-(Y)
A valid IMA mineral species - grandfathered
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About Yttrotungstite-(Y)
Formula:
YW2O6(OH)3
Colour:
Orange-yellow
Hardness:
1
Specific Gravity:
5.96
Crystal System:
Monoclinic
Name:
Named after its chemical composition containing yttrium and tungsten. The original material from 1927 was named thorotungstite as it was thought to contain thorium. A reanalysis in 1950 showed no thorium and rather yttrium, so the name was changed to yttrotungstite. A thorough reanalysis was published in 1971. The suffix was added by the IMA in 1987, following the Levinson rule for rare-earth elements.
Type Locality:
Unique Identifiers
Mindat ID:
4374
Long-form identifier:
mindat:1:1:4374:4
GUID
(UUID V4):
(UUID V4):
1c2d22bf-2917-4094-a4a3-88a6d7cebce0
IMA Classification of Yttrotungstite-(Y)
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Y(W,Fe,Si,Al,Ti)2(O,OH,H2O)9
First published:
1971
Type description reference:
Classification of Yttrotungstite-(Y)
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
49.3.3.2
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
27.4.6
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 |
---|---|---|
Ytgs-Y | 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-(Y)
Transparency:
Transparent
Colour:
Orange-yellow
Hardness:
1 on Mohs scale
Cleavage:
Distinct/Good
{010}, good; on {101}, probable, very poor.
{010}, good; on {101}, probable, very poor.
Density:
5.96 g/cm3 (Measured) 5.98 g/cm3 (Calculated)
Optical Data of Yttrotungstite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.890 nβ = 1.980 nγ = 2.020
2V:
Measured: 68° , Calculated: 64°
Max Birefringence:
δ = 0.130
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 strong
Pleochroism:
Visible
Comments:
X = pale yellow; Y = Z = dark yellow
Comments:
Z = b; X ∧ c = 26◦
Chemistry of Yttrotungstite-(Y)
Mindat Formula:
YW2O6(OH)3
Elements listed:
Crystallography of Yttrotungstite-(Y)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 6.954(6) Å, b = 6.954(9) Å, c = 5.771(6) Å
β = 104.93(4)°
β = 104.93(4)°
Ratio:
a:b:c = 1 : 1 : 0.83
Unit Cell V:
269.65 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated along [001], flattened, and always twinned to pseudo-orthorhombic symmetry. Frequently bevelled by {110} and very rarely terminated by {101}.
Twinning:
On {100}, probably universal, as contact twins.
Comment:
pseudo-orthorhombic
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014453 | Yttrotungstite-(Y) | Davis R J, Smith G W (1971) Yttrotungstite Mineralogical Magazine 38 261-285 | 1971 | Kinta district, Perak, Malaysia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.69 Å | (vvs) |
3.26 Å | (vvs) |
2.028 Å | (vs) |
6.73 Å | (ms) |
3.36 Å | (ms) |
2.869 Å | (ms) |
2.790 Å | (ms) |
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-(Y)
General Appearance of Type Material:
Yellow earthy material and as monoclinic lath-like crystals.
Place of Conservation of Type Material:
n.d.
Associated Minerals at Type Locality:
Reference:
Davis, R.J., Smith, G.W. (1971) Yttrotungstite. Mineralogical Magazine: 38, 261-285.
Synonyms of Yttrotungstite-(Y)
Other Language Names for Yttrotungstite-(Y)
German:Yttrotungstit-(Y)
Russian:Иттротунгстит-(Y)
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Yttrotungstite-(Y) associated with Alumotungstite | ◻2W2O6(H2O) |
5 photos of Yttrotungstite-(Y) associated with Hydrokenoelsmoreite | ◻2W2O6(H2O) |
2 photos of Yttrotungstite-(Y) associated with Kaolinite | Al2(Si2O5)(OH)4 |
Related Minerals - Strunz-mindat Grouping
4.FD.05 | Spertiniite | Cu(OH)2 |
4.FD.10 | Bracewellite | CrO(OH) |
4.FD.10 | Diaspore | AlO(OH) |
4.FD.10 | Groutite | Mn3+O(OH) |
4.FD.10 | Guyanaite | CrO(OH) |
4.FD.10 | Montroseite | (V3+,Fe3+)O(OH) |
4.FD.10 | Tsumgallite | GaO(OH) |
4.FD.15 | Manganite | Mn3+O(OH) |
4.FD.20 | Yttrotungstite-(Ce) | (Ce,Nd,Y)W2O6(OH)3 |
4.FD.25 | Frankhawthorneite | Cu2Te6+O4(OH)2 |
4.FD.30 | Khinite | Pb2+Cu2+3[Te6+O6](OH)2 |
4.FD.30 | Khinite-3T | Pb2+Cu2+3Te6+O6(OH)2 |
4.FD.30 | Housleyite | Pb6CuTe6+4O18(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-(Y)
mindat.org URL:
https://www.mindat.org/min-4374.html
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References for Yttrotungstite-(Y)
Localities for Yttrotungstite-(Y)
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Malaysia | |
| Sahama (1981) |
| [Colonial Geol. and Min. Resources (1950) +1 other reference |
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Kramat Pulai Mine, Kinta District, Perak, Malaysia