Kobeite-(Y) (original) (raw)
A valid IMA mineral species - grandfathered
About Kobeite-(Y)Hide
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Formula:
(Y,U)(Ti,Nb)2(O,OH)6 (?)
Colour:
Black to dark brown
Lustre:
Vitreous, Resinous
Name:
Originally named simply kobeite for the type locality of Kobe, Kyoto prefecture, Japan (Kobe-mura, Kyoto prefecture - presently Oyama-cho). The suffix was added in 1987 to denote the predominate rare-earth element.
A metamict member of the euxenite group.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2232:9
232e0f6e-67dc-47d1-91c0-745ff9d84c6c
IMA Classification of Kobeite-(Y)Hide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Renamed by the IMA
Type description reference:
Classification of Kobeite-(Y)Hide
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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
8.3.12.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.4.7
18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Kob-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 Kobeite-(Y)Hide
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Transparency:
Transparent, Translucent
Colour:
Black to dark brown
Parting:
Perpendicular to the length, probably a parting.
Density:
4.60 g/cm3 (Measured) 4.13 g/cm3 (Calculated)
Optical Data of Kobeite-(Y)Hide
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Birefringence:
Isotropic minerals have no birefringence
Comments:
Coffee-brown to brownish yellow in thin section.
Chemistry of Kobeite-(Y)Hide
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Mindat Formula:
(Y,U)(Ti,Nb)2(O,OH)6 (?)
Crystallography of Kobeite-(Y)Hide
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Cell Parameters:
a = 5.039(16) Å
Unit Cell V:
127.95 ų (Calculated from Unit Cell)
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.89 Å | (100) |
| 2.506 Å | (40) |
| 1.776 Å | (80) |
| 1.514 Å | (70) |
| 1.154 Å | (30 broad) |
| 1.126 Å | (30 broad) |
| 1.027 Å | (20 broad) |
Comments:
Shiraishi pegmatite, Japan. The data are from Hutton (1957). Data collected after heating sample for one hour at 620°C in air.
Geological EnvironmentHide
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Type Occurrence of Kobeite-(Y)Hide
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General Appearance of Type Material:
Mineral is prismatic in habit and the crystals are grouped in twin-like forms.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan (type).
Geological Setting of Type Material:
Associated Minerals at Type Locality:
Reference:
Takubo, J., Ukai, Y., Minato, T. (1950) Studies on the minerals containing rare elements (Part II) A new mineral found in Kobe-mura, Kyoto Prefecture, Japan. Chishitsugaku Zasshi: 56: 509-513.
Other Language Names for Kobeite-(Y)Hide
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Relationship of Kobeite-(Y) to other SpeciesHide
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Other Members of this group:
| Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
|---|---|---|
| Fersmite | (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) | |
| Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 | Amor. |
Related Minerals - Strunz-mindat GroupingHide
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| 4.DG.05 | Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
|---|---|---|---|
| 4.DG.05 | Fersmite | (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| 4.DG.05 | Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) | |
| 4.DG.05 | Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| 4.DG.05 | Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| 4.DG.05 | Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 | Amor. |
| 4.DG.10 | Clinofergusonite-(Y) | YNbO4 | Mon. 2/m |
| 4.DG.10 | Clinofergusonite-(Nd) | (Nd,Ce)NbO4 | Mon. |
| 4.DG.10 | Clinofergusonite-(Ce) | CeNbO4 | Mon. 2/m : _B_2/m |
| 4.DG.10 | Yttrotantalite-(Y) | (Y,U,Fe2+)(Ta,Nb)(O,OH)4 | Orth. |
| 4.DG.15 | Foordite | Sn2+Nb2O6 | Mon. 2/m : _B_2/b |
| 4.DG.15 | Thoreaulite | Sn2+Ta2O6 | Mon. 2/m : _B_2/b |
| 4.DG.20 | Raspite | Pb(WO4) | Mon. 2/m : _P_21/b |
Other InformationHide
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Notes:
Metamict, radioactive.
Internet Links for Kobeite-(Y)Hide
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References for Kobeite-(Y)Hide
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Localities for Kobeite-(Y)Hide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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.
| Austria | |
|---|---|
| Lower Austria Neunkirchen District Gloggnitz Schlossberg ⓘ |
Collection of Natural History Museum +3 other references |
| Canada | |
| Ontario ⓘ Bancroft area | T.S. Ercit - 2002 Rochester Min. ... |
| Italy | |
| Lombardy Sondrio Province Chiesa in Valmalenco ⓘ Sissone Valley | Bedognè et al. (1993) |
| Japan | |
| Ehime Prefecture Inland Sea (Setonaikai) Yuge Island ⓘ Metasomatic skarn | Yukikazu Ogoshi (2011) |
| Hiroshima Prefecture Hiroshima City Hataga ⓘ Hataga pegmatite | Pavel.M. Kartashov (n.d.) |
| ⓘ Setagawa | Petrov (n.d.) |
| Kyoto Prefecture Kyōtango City Kobe ⓘ Shiraishi-yama (Shiroishi) (TL) | Takubo et al. (1950) |
| Miyazaki Prefecture Nishiusuki District Takachiho ⓘ Takachiho mine (Takachiho Silica mine) | Petrov (n.d.) |
| Mexico | |
| Oaxaca San Francisco Telixtlahuaca Municipality San Francisco Telixtlahuaca ⓘ Muerto Mine | Prol-Ledesma et al. (2012) |
| New Zealand | |
| West Coast Region Westland District Paringa River ⓘ Weheka-Paringa Road bridge area | Hutton (1957) |
| Norway | |
| Telemark Nome ⓘ Fen Complex | Åmli (1974) |