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Kobeite-(Y)

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About Kobeite-(Y)Hide

Formula:
(REE,Fe,U)3 Zr(Ti,Nb)3 O12
Colour:
Black to dark brown
Lustre:
Vitreous, Resinous
Hardness:
Specific Gravity:
4.60
Crystal System:
Isometric
Member of:
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 dominate rare-earth element.
This page provides mineralogical data about Kobeite-(Y).


Classification of Kobeite-(Y)Hide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1950
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

Physical Properties of Kobeite-(Y)Hide

Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
Black to dark brown
Streak:
Reddish brown
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Parting:
Perpendicular to the length, probably a parting.
Fracture:
Conchoidal
Density:
4.60 g/cm3 (Measured)    4.13 g/cm3 (Calculated)

Optical Data of Kobeite-(Y)Hide

Type:
Isotropic
RI values:
n = 2.205(5)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Comments:
coffee-brown to brownish yellow in thin section

Chemical Properties of Kobeite-(Y)Hide

Formula:
(REE,Fe,U)3 Zr(Ti,Nb)3 O12
IMA Formula:
(Y,U)(Ti,Nb)2(O,OH)6 (?)

Crystallography of Kobeite-(Y)Hide

Crystal System:
Isometric
Cell Parameters:
a = 5.039(16) Å
Unit Cell V:
127.95 ų (Calculated from Unit Cell)
Z:
1
Comment:
Metamict

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of Kobeite-(Y)Hide

General Appearance of Type Material:
mineral is prismatic in habit and the crystals are grouped in twin-like forms
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

Japanese:河辺石

Relationship of Kobeite-(Y) to other SpeciesHide

Member of:
Other Members of this group:
Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6Orth. mmm (2/m 2/m 2/m)
Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
Loranskite-(Y)(Y,Ce,Ca)ZrTaO6 (?)
Polycrase-(Y)Y(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pbcn
Uranopolycrase(U4+,Y)(Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6Amor.

Related Minerals - Nickel-Strunz GroupingHide

4.DG.05Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6Orth. mmm (2/m 2/m 2/m)
4.DG.05Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DG.05Loranskite-(Y)(Y,Ce,Ca)ZrTaO6 (?)
4.DG.05Polycrase-(Y)Y(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
4.DG.05Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DG.05Uranopolycrase(U4+,Y)(Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DG.05Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6Amor.
4.DG.10Fergusonite-(Y)-βYNbO4Mon. 2/m
4.DG.10Fergusonite-(Nd)-β(Nd,Ce)NbO4
4.DG.10Fergusonite-(Ce)-βCeNbO4
4.DG.10Yttrotantalite-(Y)(Y,U4+,Fe2+)(Ta,Nb)(O,OH)4Orth.
4.DG.10Beta-Fergusonite-(Nd)(Nd,Ce)NbO4
4.DG.15FoorditeSn2+(Nb,Ta)2O6Mon. 2/m : B2/b
4.DG.15Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.
4.DG.20RaspitePb(WO4)Mon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.4.1Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)Iso.
18.4.2Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
18.4.3Yttrotantalite-(Y)(Y,U4+,Fe2+)(Ta,Nb)(O,OH)4Orth.
18.4.4IshikawaiteU4+Fe2+Nb2O8Mon.
18.4.5Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6Orth. mmm (2/m 2/m 2/m)
18.4.6Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.4.8Polycrase-(Y)Y(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
18.4.9Yttropyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.4.10Calciobetafite (of Mazzi & Munno)(Ca,Na)2(Nb,Ti)2(O,OH)7
18.4.11Yttrobetafite (of Hogarth 1977)A2-mD2X6-wZ1-n
18.4.12Samarskite-(Y)YFe3+Nb2O8Mon. 2/m : P2/b

Other InformationHide

Notes:
Metamict, radioactive
Health Risks:
Radioactive

References for Kobeite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Fleischer, M. (1951) New mineral names. American Mineralogist: 36: 925-927.
Hutton, C.O. (1957) Kobeite from Paringa River, south Westland, New Zealand. American Mineralogist: 42: 342-353.
Masutomi, K., Nagashima, K., Kato, A. (1961) Kobeite from the Ushio mines, Kyoto prefecture, Japan and re-examination of kobeite. Mineralogical Journal (Japan): 3(3): 139-147.
Nickel, E.H., Mandarino, J.A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist: 72: 1031-1042.

Internet Links for Kobeite-(Y)Hide

Localities for Kobeite-(Y)Hide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Lower Austria
    • Neunkirchen District
      • Gloggnitz
        • Schlossberg
Brandstätter, F. & Niedermayr, G. (1998): Kobeit-(Y) aus dem Riebeckitgneis- Steinbruch bei Gloggnitz, NÖ. Mineralien-Welt, 9 (03), 42; Brandstätter, F. & Niedermayr, G. (1998) Carinthia II; Collection of Natural History Museum, Vienna; U. Kolitsch (reinvestigation, to be published)
Canada
 
  • Ontario
T.S. Ercit - 2002 Rochester Min. Symposium presentation.
Italy
 
  • Lombardy
    • Sondrio Province
      • Chiesa in Valmalenco
Bedognè, F., Montrasio, A., and Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
Japan
 
  • Ehime Prefecture
    • Inland Sea (Setonaikai)
      • Yuge Island
Yukikazu Ogoshi, Tetsuo Minakawa (2011) Nb- Ta minerals in metasomatic skarn from Yuge Is. 2011 Joint Annual Meeting of Japan Association of Mineralogical Sciences and The Geological Society of Japan, Session ID: R1-P17
  • Hiroshima Prefecture
    • Hiroshima City
      • Hataga
P.M. Kartashov data
alfredo petrov specimens
  • Kyoto Prefecture
    • Kyōtango City
      • Kobe
Journ.Geol.Soc.Japan (1950) 56, 509-519
  • Miyazaki Prefecture
    • Nishiusuki District
      • Takachiho
Alfredo Petrov specimen
Mexico
 
  • Oaxaca
    • San Francisco Telixtlahuaca Municipality
      • San Francisco Telixtlahuaca
Prol-Ledesma, R.-M., Melgarejo, J.C. & Martin, R.F. (2012) The El Muerto "NYF" granitic pegmatite, Oaxaca, Mexico, and its striking enrichment in allanite-(Ce) and monazite-(Ce). Canadian Mineralogist 50, 1055-1076.
New Zealand
 
  • West Coast Region
    • Westland District
      • Paringa River
Hutton, C. Osborne. (1957) Kobeite from Paringa River, South Westland, New Zealand. American Mineralogist 42, (5) & (6): 342-353.
Norway
 
  • Telemark
    • Nome
Åmli,R. (1974): Rapport, Mineralogisk-Geologisk Museum. Mineralogiske og geokjemiske undersøkelser vedrørende scandium, niob og sjeldne jordarter i Fensfeltet, Ulefoss( p. 49) Cited in Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p. 81.
 
Mineral and/or Locality  
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