Yttrotantalite-(Y)
A valid IMA mineral species - grandfathered
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About Yttrotantalite-(Y)
Formula:
(Y,U,Fe2+)(Ta,Nb)(O,OH)4
Colour:
Brown-black to black
Lustre:
Vitreous, Greasy, Sub-Metallic
Hardness:
5 - 5½
Specific Gravity:
5.5 - 5.9
Crystal System:
Orthorhombic
Member of:
Name:
Named after its chemical composition containing yttrium and its similarity to tantalite. The suffix was added by the IMA in 1987 to denote the predominant rare-earth element.
Type Locality:
A member of the Samarskite Group according to Ercit (2005).
See also Iwashiroite-(Y) and Formanite-(Y).
See also Iwashiroite-(Y) and Formanite-(Y).
Unique Identifiers
Mindat ID:
4373
Long-form identifier:
mindat:1:1:4373:7
GUID
(UUID V4):
(UUID V4):
8d28037f-fe4c-49b2-8a57-aec4dff0f82d
IMA Classification of Yttrotantalite-(Y)
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Yttrotantalite-(Y)
4.DG.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
G : With large (+- 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
G : With large (+- medium-sized) cations; chains of edge-sharing octahedra
8.1.3.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.4.3
18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
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 |
|---|---|---|
| Yttl-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 Yttrotantalite-(Y)
Vitreous, Greasy, Sub-Metallic
Colour:
Brown-black to black
Streak:
Grey
Hardness:
5 - 5½ on Mohs scale
Cleavage:
Poor/Indistinct
On {010}.
On {010}.
Fracture:
Conchoidal
Density:
5.5 - 5.9 g/cm3 (Measured)
Optical Data of Yttrotantalite-(Y)
Colour in reflected light:
Light grayish brown
Internal Reflections:
Brown or yellowish gray
Chemistry of Yttrotantalite-(Y)
Mindat Formula:
(Y,U,Fe2+)(Ta,Nb)(O,OH)4
Common Impurities:
Nb
Crystallography of Yttrotantalite-(Y)
Crystal System:
Orthorhombic
Cell Parameters:
a = 5.34 Å, b = 10.94 Å, c = 5.07 Å
Ratio:
a:b:c = 0.488 : 1 : 0.463
Unit Cell V:
296.19 ų (Calculated from Unit Cell)
Morphology:
Prismatic [001] with {110} and {010} prominent; also tabular {010}.
Comment:
Metamict. Space group not determined.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.95 Å | (10) |
| 2.56 Å | (6) |
| 1.81 Å | (9) |
| 1.55 Å | (9) |
| 1.183 Å | (6) |
| 1.152 Å | (6) |
| 1.053 Å | (5) |
Comments:
After heating at 1000°C for one hour.
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 Yttrotantalite-(Y)
Synonyms of Yttrotantalite-(Y)
Other Language Names for Yttrotantalite-(Y)
Relationship of Yttrotantalite-(Y) to other Species
Member of:
Other Members of this group:
| Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 | Orth. mmm (2/m 2/m 2/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 |
| Shakhdaraite-(Y) | ScYNb2O8 | Mon. 2/m : P2/b |
| Srilankite | ZrTi2O6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Yttrotantalite-(Y) associated with Yttromicrolite (of Hogarth) | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 |
| 4 photos of Yttrotantalite-(Y) associated with Microcline | K(AlSi3O8) |
| 4 photos of Yttrotantalite-(Y) associated with Cleavelandite | Na(AlSi3O8) |
| 3 photos of Yttrotantalite-(Y) associated with Monazite-(Ce) | Ce(PO4) |
| 3 photos of Yttrotantalite-(Y) associated with Beryl | Be3Al2(Si6O18) |
| 3 photos of Yttrotantalite-(Y) associated with Alvite | Zr(SiO4) |
| 3 photos of Yttrotantalite-(Y) associated with Morganite | Be3Al2(Si6O18) |
| 3 photos of Yttrotantalite-(Y) associated with Fluorite | CaF2 |
| 2 photos of Yttrotantalite-(Y) associated with Albite | Na(AlSi3O8) |
| 2 photos of Yttrotantalite-(Y) associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Related Minerals - Strunz-mindat Grouping
| 4.DG.05 | Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| 4.DG.05 | Fersmite | (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 |
| 4.DG.05 | Kobeite-(Y) | (Y,U)(Ti,Nb)2(O,OH)6 (?) |
| 4.DG.05 | Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) |
| 4.DG.05 | Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 |
| 4.DG.05 | Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 |
| 4.DG.05 | Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 |
| 4.DG.10 | Clinofergusonite-(Y) | YNbO4 |
| 4.DG.10 | Clinofergusonite-(Nd) | (Nd,Ce)NbO4 |
| 4.DG.10 | Clinofergusonite-(Ce) | CeNbO4 |
| 4.DG.15 | Foordite | Sn2+Nb2O6 |
| 4.DG.15 | Thoreaulite | Sn2+Ta2O6 |
| 4.DG.20 | Raspite | Pb(WO4) |
Other Information
Health Risks:
radioactive
Internet Links for Yttrotantalite-(Y)
mindat.org URL:
https://www.mindat.org/min-4373.html
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External Links:
References for Yttrotantalite-(Y)
Localities for Yttrotantalite-(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.
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Ytterby, Resarö, Vaxholm, Stockholm County, Sweden