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Heftetjernite

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The famous Heftetjern pegmatite - June 2008

Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Formula:
ScTaO4
Colour:
Very dark brown (to greenish brown in part)
Lustre:
Adamantine
Hardness:
Crystal System:
Monoclinic
Name:
Named by U. Kolitsch, R. Kristiansen, G. Raade, and E. Tillmanns in 2006 after the type locality of Heftetjern pegmatite, Norway.
Wolframite Group.
Also known as a synthetic compound since the 1960s. The Ta analogue of ScNbO4 which may also occur in nature (cf. Kolitsch et al., 2010).

See http://www.mindat.org/mesg-55-113507.html for a warning on wrongly identified specimens sold on the mineral market.




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Classification of HeftetjerniteHide

Approved
Approval Year:
2006
First Published:
2010
4.DB.30

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
8.1.13.

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4

Physical Properties of HeftetjerniteHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
Very dark brown (to greenish brown in part)
Streak:
Dark brownish (with a reddish hue)
Hardness:
4½ on Mohs scale
Comment:
Could not be determined, but estimated to be 4.5
Cleavage:
Perfect
{010}
Fracture:
Irregular/Uneven

Optical Data of HeftetjerniteHide

Type:
Biaxial

Chemical Properties of HeftetjerniteHide

Formula:
ScTaO4

Crystallography of HeftetjerniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 4.784 Å, b = 5.693 Å, c = 5.120 Å
β = 91.15°
Ratio:
a:b:c = 0.84 : 1 : 0.899
Unit Cell V:
139.42 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular {100} observed. {010} or {001} are possibly present.
Comment:
SG P2/c

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.783 (33)
3.807 (32)
3.662 (53)
3.000 (100)
2.957 (97)
2.4877 (34)
1.7639 (27)
1.7157 (22)
Comments:
Calculated data.

Type Occurrence of HeftetjerniteHide

General Appearance of Type Material:
In a single small vug in albite, on the surface or in between a metamict Ti-Y-Ta-Nb-mineral as elongate tabular to columnar, subparallel crystals (ca 0.4-0,1mm)
Geological Setting of Type Material:
Cleavelandite-amazonite pegmatite
Associated Minerals at Type Locality:

Synonyms of HeftetjerniteHide

Other Language Names for HeftetjerniteHide

Relationship of Heftetjernite to other SpeciesHide

Other Members of this group:
FerberiteFeWO4Mon. 2/m : P2/b
HuanzalaiteMgWO4Mon. 2/m : P2/b
HübneriteMnWO4Mon. 2/m : P2/b
Rossovskyite(Fe3+,Ta)(Nb,Ti)O4Mon. 2/m : P2/b
Sanmartinite(Zn,Fe)WO4Mon. 2/m : P21/b

Related Minerals - Nickel-Strunz GroupingHide

4.DB.05ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
4.DB.05PyrolusiteMnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05TripuhyiteFe3+Sb5+O4Tet.
4.DB.05TugarinoviteMoO2Mon.
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10OrdoñeziteZnSb2O6Tet.
4.DB.15bAkhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2Hex.
4.DB.15aParamontroseiteV4+O2Orth.
4.DB.15aRamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
4.DB.20Scrutinyiteα-PbO2Orth.
4.DB.25IshikawaiteU4+Fe2+Nb2O8Mon.
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25SrilankiteZrTi2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Mon. 2/m : P2/b
4.DB.30FerberiteFeWO4Mon. 2/m : P2/b
4.DB.30HübneriteMnWO4Mon. 2/m : P2/b
4.DB.30Sanmartinite(Zn,Fe)WO4Mon. 2/m : P21/b
4.DB.30KrasnoselskiteCoWO4Mon.
4.DB.30HuanzalaiteMgWO4Mon. 2/m : P2/b
4.DB.35Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8Mon.
4.DB.40LithiotantiteLiTa3O8Mon.
4.DB.40LithiowodginiteLiTa3O8Mon.
4.DB.40TitanowodginiteMn2+TiTa2O8Mon.
4.DB.40WodginiteMn2+Sn4+Ta2O8Mon.
4.DB.40FerrotitanowodginiteFe2+TiTa2O8Mon.
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)Mon.
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]Mon. 2/m : P21/b
4.DB.55AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.60Biehlite((Sb,As)O)2[MoO4]Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HeftetjerniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keller, C. (1962) Über ternäre Oxide des Niobs und Tantals vom Typ ABO4. Z. Anorg. Allg. Chemie: 318: 89-106.
Rooksby, H.P., White, E.A.D. (1963) The structures of 1:1 compounds of rare-earth oxides with niobia and tantala. Acta Crystallographica: 16: 888-890.
Vladimirova, Z.A., Trunov, V.K., Komissarova, L.N. (1970) Reaction of scandium oxide with niobium and tantalum pentoxides. Zhurnal Neorganicheskoi Khimii: 15: 2862-2864. (in Russian)
Zhong, W.L., Zhang, P.L., Chen, H.C. (1984) A new ferroelectric crystal - ScTaO4. Solid State Communications: 49: 467-469.
Yokogawa, Y., Yoshimura, M. (1999) High-temperature phase relations in the Sc2O3-Ta2O5 system. Journal of the American Ceramic Society: 82: 1585-1588.
Kristiansen, R. (2009) A unique assemblage of Scandium-bearing minerals from the Heftetjern-pegmatite, Tørdal, south Norway. Norsk Bergverksmuseum Skrift: 41: 75-104.
Kolitsch, U., Kristiansen, R., Raade, G. Tillmanns, E. (2010) Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tørdal, Norway. European Journal of Mineralogy: 22: 309-316.
Kristiansen, R. (2010) Heftetjernitt og triklin titanitt fra Heftetjern i Tørdal. Stein: 37(4): 20-22.
Poirier, G., Tait, K.T., Rowe, R. (2011) New mineral names. American Mineralogist: 96: 936-945.

Internet Links for HeftetjerniteHide

Localities for HeftetjerniteHide

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

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Norway (TL)
 
  • Telemark
    • Drangedal
      • Tørdal
Kristiansen, R. (2009): A unique assemblage of Scandium-bearing minerals from the Heftetjern-pegmatite, Tørdal, south Norway. Norsk Bergverksmuseum Skrifter, 41, 75-104; Kolitsch, U., Kristiansen, R., Raade, G. & Tillmanns, E. (2010): Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tørdal, Norway. Eur. J. Mineral. 22, 309-316.
Mineral and/or Locality  
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