Shakhdaraite-(Y)
A valid IMA mineral species
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About Shakhdaraite-(Y)
Formula:
ScYNb2O8
Colour:
Black to dark-brown
Lustre:
Vitreous, Sub-Metallic
Hardness:
5
Specific Gravity:
5.602 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after the Shakhdara river valley, Tajikistan where the type locality occurs.
Type Locality:
Isostructural with:
Isostructural with samarskite-(Y), its Fe(III) analogue.
Structurally related to brookite. Unique combination of elements (at the upload).
Associates with an unnamed Sc-Nb oxide, among others.
Structure details:
* [6]M(1) = Nb
* [6]M(2) = Sc
* [8]M(3) = Y
* M(1) and M(2) form brookite-type chains || c
* [8]M(3A) polyhedra form a brookite-like kinked chain, which shares two edges with two M(3A) polyhedra from the adjacent brookite-like chain → [Y2O8]10– layer
* the brookite chains and the M(3A) polyhedral layer alternate along a.
Structurally related to brookite. Unique combination of elements (at the upload).
Associates with an unnamed Sc-Nb oxide, among others.
Structure details:
* [6]M(1) = Nb
* [6]M(2) = Sc
* [8]M(3) = Y
* M(1) and M(2) form brookite-type chains || c
* [8]M(3A) polyhedra form a brookite-like kinked chain, which shares two edges with two M(3A) polyhedra from the adjacent brookite-like chain → [Y2O8]10– layer
* the brookite chains and the M(3A) polyhedral layer alternate along a.
Unique Identifiers
Mindat ID:
55036
Long-form identifier:
mindat:1:1:55036:1
IMA Classification of Shakhdaraite-(Y)
Approved
IMA Formula:
ScYNb5+2O8
First published:
2022
Type description reference:
Pautov, Leonid A., Mirakov, Mirak A., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir, Faiziev, Abdulkhak R. (2022) Shakhdaraite-(Y), ScYNb2O8, from the Leskhozovskaya granitic pegmatite, the valley of the Shakhdara River, southwestern Pamir, Gorno-Badakhshanskii Autonomous Region, Tajikistan: New mineral description and crystal structure. The Canadian Mineralogist, 60 (2) 369-382 doi:10.3749/canmin.2000122
Classification of Shakhdaraite-(Y)
4.DB.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
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 |
|---|---|---|
| Skd-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 Shakhdaraite-(Y)
Vitreous, Sub-Metallic
Colour:
Black to dark-brown
Streak:
Brown
Hardness:
5 on Mohs scale
Hardness:
VHN100=436 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
5.602 g/cm3 (Calculated)
Optical Data of Shakhdaraite-(Y)
Anisotropism:
Distinct, but without colour effects
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 14.6% | 13.9% |
| 546nm | 14.0% | 13.4% |
| 589nm | 13.9% | 13.3% |
| 650nm | 13.8% | 13.1% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 14.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light gray
Internal Reflections:
Red-brown
Pleochroism:
Non-pleochroic
Comments:
Moderate to low reflective capacity.
Chemistry of Shakhdaraite-(Y)
Mindat Formula:
ScYNb2O8
Element Weights:
Elements listed:
Crystallography of Shakhdaraite-(Y)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/c
Cell Parameters:
a = 9.930(2) Å, b = 5.662(1) Å, c = 5.211(1) Å
β = 92.38(3)°
β = 92.38(3)°
Ratio:
a:b:c = 1.754 : 1 : 0.92
Unit Cell V:
292.73 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.72 Å | (35) |
| 3.073 Å | (100) |
| 2.990 Å | (85) |
| 2.832 Å | (20) |
| 2.603 Å | (24) |
| 2.484 Å | (33) |
| 1.916 Å | (23) |
| 1.867 Å | (21) |
Locality:
Reference:
Pautov, Leonid A., Mirakov, Mirak A., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir, Faiziev, Abdulkhak R. (2022) Shakhdaraite-(Y), ScYNb2O8, from the Leskhozovskaya granitic pegmatite, the valley of the Shakhdara River, southwestern Pamir, Gorno-Badakhshanskii Autonomous Region, Tajikistan: New mineral description and crystal structure. The Canadian Mineralogist, 60 (2) 369-382 doi:10.3749/canmin.2000122
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Shakhdaraite-(Y)
General Appearance of Type Material:
(1) grains, 10-150 μm in size; (2) a single, well-shaped crystal, 200 μm in length.
Place of Conservation of Type Material:
collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5569/1.
Geological Setting of Type Material:
Miarolitic granitic pegmatite.
Associated Minerals at Type Locality:
Reference:
Pautov, Leonid A., Mirakov, Mirak A., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir, Faiziev, Abdulkhak R. (2022) Shakhdaraite-(Y), ScYNb2O8, from the Leskhozovskaya granitic pegmatite, the valley of the Shakhdara River, southwestern Pamir, Gorno-Badakhshanskii Autonomous Region, Tajikistan: New mineral description and crystal structure. The Canadian Mineralogist, 60 (2) 369-382 doi:10.3749/canmin.2000122
Other Language Names for Shakhdaraite-(Y)
Dutch:Shakhdaraiet-(Y)
German:Shakhdarait-(Y)
Relationship of Shakhdaraite-(Y) to other Species
Member of:
Other Members of Samarskite Group:
| Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 | Orth. mmm(2/m2/m2/m) |
| Ishikawaite | U4+Fe2+Nb2O8 | Mon. |
| Samarskite-(Y) | YFe3+Nb2O8 | Mon. 2/m : P2/b |
| Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 | Mon. 2/m : P2/b |
| Yttrotantalite-(Y) | (Y,U,Fe2+)(Ta,Nb)(O,OH)4 | Orth. |
Common Associates
Associations Based on Photo Data:
| 1 photo of Shakhdaraite-(Y) associated with Pyrochlore Group | A2Nb2(O,OH)6Z |
| 1 photo of Shakhdaraite-(Y) associated with Bertrandite | Be4(Si2O7)(OH)2 |
| 1 photo of Shakhdaraite-(Y) associated with Jarosite | KFe3+3(SO4)2(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 4.DB. | Tianhongqiite | CrTiO3(OH) |
| 4.DB. | Nioboheftetjernite | ScNbO4 |
| 4.DB. | Huangshanite | Fe3+TaO4 |
| 4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
| 4.DB.05 | Varlamoffite | Sn1-xFexO2-x(OH) |
| 4.DB.05 | Argutite | GeO2 |
| 4.DB.05 | Cassiterite | SnO2 |
| 4.DB.05 | Rutile | TiO2 |
| 4.DB.05 | Plattnerite | PbO2 |
| 4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
| 4.DB.05 | Tugarinovite | MoO2 |
| 4.DB.05 | Pyrolusite | Mn4+O2 |
| 4.DB.10 | Byströmite | MgSb2O6 |
| 4.DB.10 | Ordoñezite | ZnSb2O6 |
| 4.DB.10 | Tredouxite | NiSb2O6 |
| 4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
| 4.DB.10 | Tapiolite-(Fe) | Fe2+Ta2O6 |
| 4.DB.15a | Paramontroseite | V4+O2 |
| 4.DB.15a | Ramsdellite | Mn4+O2 |
| 4.DB.15b | Akhtenskite | ε-Mn4+O2 |
| 4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 4.DB.20 | Scrutinyite | α-PbO2 |
| 4.DB.20 | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
| 4.DB.25 | Ishikawaite | U4+Fe2+Nb2O8 |
| 4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
| 4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
| 4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
| 4.DB.25 | Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 |
| 4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
| 4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
| 4.DB.25 | Nioboixiolite-(Fe2+) | (Nb0.67Fe2+0.33)O2 |
| 4.DB.25 | Srilankite | TiO2 |
| 4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
| 4.DB.25 | Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 |
| 4.DB.30 va | Wolframite Group | |
| 4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| 4.DB.30 | Huanzalaite | MgWO4 |
| 4.DB.30 | Heftetjernite | ScTaO4 |
| 4.DB.30 | Hübnerite | MnWO4 |
| 4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
| 4.DB.30 | Ferberite | FeWO4 |
| 4.DB.30 | 'Krasnoselskite' | CoWO4 |
| 4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
| 4.DB.35 | Tantalaeschynite-(Ce) | Ce(TiTa)O6 |
| 4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
| 4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
| 4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
| 4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
| 4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
| 4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
| 4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
| 4.DB.40 | 'Wolframowodginite' | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
| 4.DB.40 | Lithiotantite | LiTa3O8 |
| 4.DB.40 | Lithiowodginite | LiTa3O8 |
| 4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
| 4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
| 4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
| 4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
| 4.DB.45 | Tivanite | V3+TiO3(OH) |
| 4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
| 4.DB.55 | Alumotantite | AlTaO4 |
| 4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
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 Shakhdaraite-(Y)
mindat.org URL:
https://www.mindat.org/min-55036.html
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References for Shakhdaraite-(Y)
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 56. European Journal of Mineralogy, 32 (4) 443-448 doi:10.5194/ejm-32-443-2020
Pautov, Leonid A., Mirakov, Mirak A., Sokolova, Elena, Day, Maxwell C., Hawthorne, Frank C., Schodibekov, Manuchekhr A., Karpenko, Vladimir Yu., Makhmadsharif, Saimudasir, Faiziev, Abdulkhak R. (2022) Shakhdaraite-(Y), ScYNb2O8, from the Leskhozovskaya granitic pegmatite, the valley of the Shakhdara River, southwestern Pamir, Gorno-Badakhshanskii Autonomous Region, Tajikistan: New mineral description and crystal structure. The Canadian Mineralogist, 60 (2) 369-382 doi:10.3749/canmin.2000122
Localities for Shakhdaraite-(Y)
Showing 1 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.
Tajikistan (TL) | |
| Miyawaki et al. (2020) +1 other reference |
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Leskhozovskiy granitic pegmatite, Shakhdara Range, Roshtqal'a, Gorno-Badakhshan, Tajikistan