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Heftetjernite

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Formula:
ScTaO4
System:
Monoclinic
Colour:
Very dark brown (to ...
Lustre:
Adamantine
Hardness:
Name:
Named after the type locality.
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.




Classification of Heftetjernite

Approved
Approval Year:
2006
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 Heftetjernite

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

Optical Data of Heftetjernite

Type:
Biaxial

Chemical Properties of Heftetjernite

Formula:
ScTaO4
Elements listed in formula:

Crystallography of Heftetjernite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 4.784Å, b = 5.693Å, c = 5.120Å
β = 91.15°
Ratio:
a:b:c = 0.84 : 1 : 0.899
Unit Cell Volume:
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 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 Heftetjernite

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

Relationship of Heftetjernite to other Species

Other Members of Group:
FerberiteFeWO4
HuanzalaiteMgWO4
HübneriteMnWO4
Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
Sanmartinite(Zn,Fe)WO4
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb25+O6
4.DB.10Tapiolite-(Fe)Fe2+Ta2O6
4.DB.10Tapiolite-(Mn)Mn2+Ta2O6
4.DB.10OrdoñeziteZnSb25+O6
4.DB.15bAkhtenskiteMnO2
4.DB.15cNsutiteMnx2+Mn4+1-xO2-2x(OH)2x
4.DB.15aParamontroseiteVO2
4.DB.15aRamsdelliteMn4+O2
4.DB.20ScrutinyitePbO2
4.DB.25Ishikawaite(U,Fe,Y)NbO4
4.DB.25Ixiolite(Ta,Mn,Nb)O2
4.DB.25Samarskite-(Y)(Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4
4.DB.25SrilankiteTi2ZrO6
4.DB.25Yttrocolumbite-(Y)(Y,U,Fe2+)(Nb,Ta)O4
4.DB.25Calciosamarskite(Ca,Fe,Y)(Nb,Ta,Ti)O4
4.DB.25Samarskite-(Yb)YbNbO4
4.DB.30FerberiteFe2+WO4
4.DB.30HübneriteMn2+WO4
4.DB.30SanmartiniteZnWO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)Fe2+Nb2O6
4.DB.35Tantalite-(Fe)Fe2+Ta2O6
4.DB.35Columbite-(Mn)Mn2+Nb2O6
4.DB.35Tantalite-(Mn)Mn2+Ta2O6
4.DB.35Columbite-(Mg)MgNb2O6
4.DB.35QitianlingiteFe22+Nb2W6+O10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)MgTa2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteTiV3+O3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)(O,OH)2
4.DB.55AlumotantiteAlTaO4
4.DB.60BiehliteSb23+MoO6

Other Names for Heftetjernite

Name in Other Languages:

Other Information

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 Heftetjernite

Reference List:
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 Crystallogr., 16, 888-890.

Vladimirova, Z.A., Trunov, V.K., Komissarova, L.N. (1970): Reaction of scandium oxide with niobium and tantalum pentoxides. Zh. Neorg. Khim., 15, 2862-2864 (in Russian).

Zhong, W.L., Zhang, P.L., Chen, H.C. (1984): A new ferroelectric crystal - ScTaO4. Sol. State Comm., 49, 467-469.

Yokogawa, Y. & Yoshimura, M. (1999): High-temperature phase relations in the Sc2O3-Ta2O5 system. J. Am. Ceram. Soc., 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. Eur. J. Mineral. 22, 309-316.

Kristiansen, R. (2010): Heftetjernitt og triklin titanitt fra Heftetjern i Tørdal. Stein. 37 (4): 20-22

Internet Links for Heftetjernite

mindat.org URL:
https://www.mindat.org/min-38788.html
Please feel free to link to this page.

Localities for Heftetjernite

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.
(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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