Euxenite-(Y)
A valid IMA mineral species - grandfathered
This page is currently not sponsored. Click here to sponsor this page.
About Euxenite-(Y)
Formula:
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Usually the sum (Nb+Ta) is close to Ti, in other words (Nb+Ta)/Ti ~ 1.
Synthetic end-member: YTiNbO6
Synthetic end-member: YTiNbO6
Colour:
Black, greenish or brownish tint at times
Lustre:
Vitreous, Greasy, Sub-Metallic
Hardness:
5½ - 6½
Specific Gravity:
5.3 - 5.9
Crystal System:
Orthorhombic
Member of:
Name:
From the Greek εΰζευος, friendly to strangers, hospitale, in allusion to the many rare elements that it contains.
Type Locality:
Isostructural with:
Minerals of the Euxenite-(Y)-Polycrase-(Y) series are the most widespread niobates after columbite-(Fe) and pyrochlore.
Euxenite-(Y) is typically metamict.
Compare Nioboaeschynite-(Y) which has different space-group symmetry. Compare also Fergusonite-(Y).
Possibly identical to polycrase-(Y)? - see the discussion in http://www.mindat.org/mesg-104-381642.html.
An euxenite-(Y)-columbite solid solution is also known.
Euxenite-(Y) is typically metamict.
Compare Nioboaeschynite-(Y) which has different space-group symmetry. Compare also Fergusonite-(Y).
Possibly identical to polycrase-(Y)? - see the discussion in http://www.mindat.org/mesg-104-381642.html.
An euxenite-(Y)-columbite solid solution is also known.
Unique Identifiers
Mindat ID:
1425
Long-form identifier:
mindat:1:1:1425:6
GUID
(UUID V4):
(UUID V4):
3ef27e33-959c-405a-9951-ed2d56ea9d9e
IMA Classification of Euxenite-(Y)
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Y(Ti,Nb)2(O,OH)6
Classification of Euxenite-(Y)
4.DG.05
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
8.3.8.2
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.4.5
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 |
---|---|---|
Eux-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 Euxenite-(Y)
Vitreous, Greasy, Sub-Metallic
Colour:
Black, greenish or brownish tint at times
Comment:
Brown to yellow brown in transmitted light.
Streak:
Yellowish, grayish, reddish brown
Hardness:
5½ - 6½ on Mohs scale
Hardness:
VHN50=633 - 692 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Conchoidal, Sub-Conchoidal
Density:
5.3 - 5.9 g/cm3 (Measured) 5.16 g/cm3 (Calculated)
Optical Data of Euxenite-(Y)
Type:
Isotropic
RI values:
n = 2.06 - 2.24
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Chemistry of Euxenite-(Y)
Mindat Formula:
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Usually the sum (Nb+Ta) is close to Ti, in other words (Nb+Ta)/Ti ~ 1.
Synthetic end-member: YTiNbO6
Usually the sum (Nb+Ta) is close to Ti, in other words (Nb+Ta)/Ti ~ 1.
Synthetic end-member: YTiNbO6
Chemical Analysis
Oxide wt%:
1 | |
---|---|
Nb2O5 | 23.49 % |
Ta2O5 | 2.55 % |
TiO2 | 25.64 % |
SiO2 | 0.47 % |
SnO2 | 0.12 % |
UO2 | 7.95 % |
ThO2 | 2.40 % |
REE total | 25.77 % |
Sc2O3 | 0.03 % |
PbO | 0.12 % |
Al2O3 | 0.07 % |
FeO | 0.40 % |
Fe2O3 | 4.66 % |
MnO | 0.18 % |
MgO | 0.08 % |
CaO | 2.8 % |
BaO | 0.0014 % |
SrO | 0.001 % |
Cr2O3 | 0.001 % |
CoO | 0.001 % |
NiO | 0.001 % |
CuO | 0.001 % |
H20 | 3.26 % |
Total: | 99.9964 % |
Sample references:
ID | Locality | Reference | Notes |
---|---|---|---|
1 | Kalstadgangen, Lindvikskollen-Kalstadgangen pegmatite, Kragerø, Telemark, Norway | Whetchemical analyses Note: The stannic oxide is contaminated with barium. |
Crystallography of Euxenite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Setting:
Pbcn
Cell Parameters:
a = 5.5528(6) Å, b = 14.6432(20) Å, c = 5.1953(7) Å
Ratio:
a:b:c = 0.379 : 1 : 0.355
Unit Cell V:
422.43 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Stout prismatic [001]. The faces are striated parallel to their intersection with {010} Often in parallel or subparallel and slightly radial aggregates of crystals. Massive.
Twinning:
1. On {201}, common. The twins are flattened {010} and striated [001] 2. Possibly on {101}, rare. 3. Possibly on {013}.
Comment:
Typically metamict; heating at high temperatures will restore crystallinity.
Crystallographic forms of Euxenite-(Y)
Crystal Atlas:
Image Loading
Click on an icon to view
3d models and HTML5 code kindly provided by
www.smorf.nl.
Toggle
Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
Toggle
Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
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) |
---|---|---|---|---|---|---|---|
0010827 | Euxenite-(Y) | Weitzel H, Schrocke H (1980) Kristallstrukturverfeinerungen von euxenit, Y(Nb0.5Ti0.5)2O6, und M-fergusonit, YNbO4 Zeitschrift fur Kristallographie 152 69-82 | 1980 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.66 Å | (3) |
2.98 Å | (10) |
2.43 Å | (3) |
1.82 Å | (4) |
1.77 Å | (3) |
1.72 Å | (4) |
1.64 Å | (3) |
1.49 Å | (4) |
Comments:
Heated
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
26 : Hadean detrital minerals | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Geological Setting:
Granitic pegmatites. Placer deposits.
Type Occurrence of Euxenite-(Y)
Synonyms of Euxenite-(Y)
Other Language Names for Euxenite-(Y)
Relationship of Euxenite-(Y) to other Species
Member of:
Other Members of this group:
Fersmite | (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
Kobeite-(Y) | (Y,U)(Ti,Nb)2(O,OH)6 (?) | Iso. |
Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) | |
Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 | Amor. |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
15 photos of Euxenite-(Y) associated with Magnetite | Fe2+Fe3+2O4 |
15 photos of Euxenite-(Y) associated with Microcline | K(AlSi3O8) |
13 photos of Euxenite-(Y) associated with Columbite-(Fe)-Columbite-(Mn) Series | |
13 photos of Euxenite-(Y) associated with Chlorite Group | |
11 photos of Euxenite-(Y) associated with Quartz | SiO2 |
11 photos of Euxenite-(Y) associated with Albite | Na(AlSi3O8) |
11 photos of Euxenite-(Y) associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
10 photos of Euxenite-(Y) associated with Beryl | Be3Al2(Si6O18) |
10 photos of Euxenite-(Y) associated with Zircon | Zr(SiO4) |
10 photos of Euxenite-(Y) associated with Monazite-(Ce) | Ce(PO4) |
Related Minerals - Strunz-mindat Grouping
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.10 | Yttrotantalite-(Y) | (Y,U,Fe2+)(Ta,Nb)(O,OH)4 |
4.DG.15 | Foordite | Sn2+Nb2O6 |
4.DG.15 | Thoreaulite | Sn2+Ta2O6 |
4.DG.20 | Raspite | Pb(WO4) |
Other Information
Health Risks:
May be radioactive.
Internet Links for Euxenite-(Y)
mindat.org URL:
https://www.mindat.org/min-1425.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 Euxenite-(Y)
Reference List:
Localities for Euxenite-(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.
Quick NavTopAbout Euxenite-(Y)Unique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography Crystallographic forms Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Håverstad, Iveland, Agder, Norway