Tantalaeschynite-(Y)
A valid IMA mineral species
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About Tantalaeschynite-(Y)
Formula:
Y(Ta,Ti,Nb)2O6
Colour:
Brownish black, black
Lustre:
Resinous
Hardness:
5½ - 6
Specific Gravity:
5.75 - 6.13
Crystal System:
Orthorhombic
Member of:
Name:
Named as the tantalian end-member of a series with aeschynite-(Y). The species was originally named tantal-aeschynite but changed to tantalaeschynite by the IMA in 2007. The suffix was added to conform to the IMA's Levinson rule for minerals with essential rare-earth elements.
Type Locality:
Unique Identifiers
Mindat ID:
3881
Long-form identifier:
mindat:1:1:3881:8
GUID
(UUID V4):
(UUID V4):
9d749b65-7a3c-4021-b062-fdd04dec920a
IMA Classification of Tantalaeschynite-(Y)
Classification of Tantalaeschynite-(Y)
4.DF.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
F : With large (+- medium-sized) cations; dimers and trimers of edgesharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
F : With large (+- medium-sized) cations; dimers and trimers of edgesharing octahedra
8.3.6.4
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.2.18
18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U
18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U
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 |
|---|---|---|
| Taes-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 Tantalaeschynite-(Y)
Resinous
Colour:
Brownish black, black
Comment:
Transparent, yellowish-orange in thin section
Streak:
Pale yellowish brown
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN100=657 - 673 kg/mm2 - Vickers
Cleavage:
None Observed
Density:
5.75 - 6.13 g/cm3 (Measured) 6.39 g/cm3 (Calculated)
Optical Data of Tantalaeschynite-(Y)
Anisotropism:
Isotropic due to metamictization
Reflectivity:
| Wavelength | R |
|---|---|
| 470nm | 14.5% |
| 546nm | 14.2% |
| 589nm | 14.0% |
| 650nm | 14.0% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 14.5%.
Colour in reflected light:
Dark grey in oil
Internal Reflections:
Abundant; white, yellowish-orange, dark red
Chemistry of Tantalaeschynite-(Y)
Mindat Formula:
Y(Ta,Ti,Nb)2O6
Crystallography of Tantalaeschynite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.38 Å, b = 10.97 Å, c = 5.34 Å
Ratio:
a:b:c = 0.673 : 1 : 0.487
Unit Cell V:
432.32 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Forms {010}, {001}, {110} and {130}.
Comment:
Space group Pmnb (non-standard setting)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.00 Å | (100) |
| 2.94 Å | (100) |
| 1.581 Å | (70) |
| 2.65 Å | (50) |
| 1.70 Å | (50) |
| 1.86 Å | (40) |
Comments:
After heating in air at 1300 C.
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 Tantalaeschynite-(Y)
General Appearance of Type Material:
Idiomorphic prismatic crystals showing a typical orthorhombic morphology. Dimensions to more than 5 x 3 x 2 cm.
Place of Conservation of Type Material:
Department of Geosciences, University of Brasilia, Brasilia, Brazil, NT-52.
Institute of Earth Sciences, Free University of Amsterdam, Amsterdam, The Netherlands, NT-52.
Institute of Earth Sciences, Free University of Amsterdam, Amsterdam, The Netherlands, NT-52.
Geological Setting of Type Material:
Homogeneous pegmatite.
Associated Minerals at Type Locality:
Synonyms of Tantalaeschynite-(Y)
Aeschynite (in part)
Other Language Names for Tantalaeschynite-(Y)
German:Tantalaeschynit-(Y)
Relationship of Tantalaeschynite-(Y) to other Species
Member of:
Other Members of this group:
| Aeschynite-(Ce) | (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) : Pmna |
| Aeschynite-(Nd) | (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) |
| Aeschynite-(Y) | (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) : Pmna |
| Nioboaeschynite-(Ce) | (Ce,Ca)(Nb,Ti)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) |
| Nioboaeschynite-(Nd) | (Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6 | Orth. |
| Nioboaeschynite-(Y) | (Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) : Pban |
| Rynersonite | CaTa2O6 | Orth. mmm (2/m 2/m 2/m) |
| UM2001-09-O:CaNbREESiTiY | (Ca,Y,REE)(Ti,Nb,Si)2(O,OH)6 | |
| Vigezzite | (Ca,Ce)(Nb,Ta,Ti)2O6 | Orth. mmm (2/m 2/m 2/m) : Pnma |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Tantalaeschynite-(Y) associated with Fergusonite-(Y) | YNbO4 |
| 1 photo of Tantalaeschynite-(Y) associated with Formanite-(Y) | YTaO4 |
Related Minerals - Strunz-mindat Grouping
| 4.DF.05 | Aeschynite-(Ce) | (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 |
| 4.DF.05 | Aeschynite-(Nd) | (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6 |
| 4.DF.05 | Aeschynite-(Y) | (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 |
| 4.DF.05 | Nioboaeschynite-(Ce) | (Ce,Ca)(Nb,Ti)2(O,OH)6 |
| 4.DF.05 | Nioboaeschynite-(Nd) | (Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6 |
| 4.DF.05 | Nioboaeschynite-(Y) | (Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6 |
| 4.DF.05 | Rynersonite | CaTa2O6 |
| 4.DF.05 | Vigezzite | (Ca,Ce)(Nb,Ta,Ti)2O6 |
| 4.DF.10 | Changbaiite | PbNb2O6 |
| 4.DF.15 | Murataite-(Y) | (Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 |
Other Information
Thermal Behaviour:
A sharp exothermic peak at 740°C, which is also characteristic for aeschynite, and is due to crystallization of the mineral.
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 Tantalaeschynite-(Y)
mindat.org URL:
https://www.mindat.org/min-3881.html
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References for Tantalaeschynite-(Y)
Localities for Tantalaeschynite-(Y)
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.
Brazil (TL) | |
| Rocks & Minerals (Jan.2000) +1 other reference |
China | |
| Yihong Sun and Xiangmei Ren (1986) |
Poland | |
| SZEŁĘG E. |
Switzerland | |
| forum.amiminerals.it (2020) |
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Paszowice quarry, Gmina Paszowice, Jawor County, Lower Silesian Voivodeship, Poland