Mindat Logo
Home Page Log In Messageboard The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Heftetjernite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
© Roy Kristiansen

Show Heftetjernite Photos (2)



Formula:
ScTaO
 
4
System:MonoclinicColour:Very dark brown (to ...
Hardness:4½
Member of:Wolframite Group
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

IMA status:Approved 2006
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:8.1.13.

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
mindat.org URL:http://www.mindat.org/min-38788.html
Please feel free to link to this page.

Type Occurrence of Heftetjernite

Type Locality:Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
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)
Year of Discovery:1999
Geological Setting of type material:Cleavelandite-amazonite pegmatite
Associated Minerals at type locality:
Pyrochlore SupergroupPyrochlore SupergroupPyrochlore SupergroupMuscoviteMilarite
FluoriteAlbite

Physical Properties of Heftetjernite

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

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:
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.

Optical Data of Heftetjernite

Type:Biaxial

Chemical Properties of Heftetjernite

Formula:
ScTaO
 
4
Essential elements:O, Sc, Ta
All elements listed in formula:O, Sc, Ta

Relationship of Heftetjernite to other Species

Member of:Wolframite Group
Other Members of Group:

- +
Ferberite
FeWO
 
4
Huanzalaite
MgWO
 
4
Hübnerite
MnWO
 
4
Sanmartinite
(Zn,Fe)WO
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
4.DB.05Argutite
GeO
 
2
4.DB.05Cassiterite
SnO
 
2
4.DB.05Plattnerite
PbO
 
2
4.DB.05Pyrolusite
MnO
 
2
4.DB.05Rutile
TiO
 
2
4.DB.05Tripuhyite
Fe
3+
 
Sb
5+
 
O
 
4
4.DB.05Tugarinovite
MoO
 
2
4.DB.05Varlamoffite
(Sn,Fe)(O,OH)
 
2
4.DB.10Byströmite
MgSb
 
2
O
 
6
4.DB.10Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
4.DB.10Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
4.DB.10Ordoñezite
ZnSb
 
2
O
 
6
4.DB.15bAkhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15cNsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15aParamontroseite
V
4+
 
O
 
2
4.DB.15aRamsdellite
Mn
4+
 
O
 
2
4.DB.20Scrutinyite
alpha-PbO
 
2
4.DB.25Ishikawaite
U
4+
 
Fe
2+
 
Nb
 
2
O
 
8
4.DB.25Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
4.DB.25Samarskite-(Y)
(Y,Fe
3+
 
,Fe
2+
 
,U,Th,Ca)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Srilankite
ZrTi
 
2
O
 
6
4.DB.25Yttrocolumbite-(Y)
Y(U
4+
 
,Fe
2+
 
)Nb
 
2
O
 
8
4.DB.25Calciosamarskite
(Ca,Fe
3+
 
,Y)
 
2
(Nb,Ta,Ti)
 
2
O
 
8
4.DB.25Samarskite-(Yb)
(Yb,Fe
3+
 
)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.30Ferberite
FeWO
 
4
4.DB.30Hübnerite
MnWO
 
4
4.DB.30Sanmartinite
(Zn,Fe)WO
 
4
4.DB.30Krasnoselskite
CoWO
 
4
4.DB.30Huanzalaite
MgWO
 
4
4.DB.35Columbite-(Fe)
FeNb
 
2
O
 
6
4.DB.35Tantalite-(Fe)
FeTa
 
2
O
 
6
4.DB.35Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
4.DB.35Tantalite-(Mn)
MnTa
 
2
O
 
6
4.DB.35Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
4.DB.35Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10
4.DB.35Magnocolumbite
4.DB.35Tantalite-(Mg)
(Mg,Fe
2+
 
)(Ta,Nb)
 
2
O
 
6
4.DB.40Ferrowodginite
FeSnTa
 
2
O
 
8
4.DB.40Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
4.DB.40Lithiowodginite
LiTa
 
3
O
 
8
4.DB.40Titanowodginite
MnTiTa
 
2
O
 
8
4.DB.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
4.DB.40Ferrotitanowodginite
Fe
2+
 
TiTa
 
2
O
 
8
4.DB.40Wolframowodginite
Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)
 
2
O
 
8
4.DB.45Tivanite
V
3+
 
TiO
 
3
(OH)
4.DB.50Carmichaelite
(Ti,Cr,Fe)[O
 
2-x
(OH)
 
x
]
4.DB.55Alumotantite
AlTaO
 
4
4.DB.60Biehlite
((Sb,As)O)
 
2
[MoO
 
4
]

Other Names for Heftetjernite

Synonyms:
IMA2006-056
Other Languages:

Other Information

Health Warning: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

Search Engines:
  • Look for Heftetjernite on Google
  • Look for Heftetjernite images on Google
    • External Links:
  • Look for Heftetjernite on Webmineral
  • Look for Heftetjernite on Athena Mineralogy
  • Look for Heftetjernite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
    • Mineral Dealers:
  • SpiriferMinerals.com - high quality low prices
  • The Arkenstone - Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • rare and unusual minerals mainly crystallized
  • Top quality minerals from Kristalle of California
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy RARE Minerals from Rocks of Africa
  • Search for minerals at Heliodor
  • Wilensky Fine Minerals
  • Search for Heftetjernite on Well-Arranged Molecules
  • Fabre Minerals - search for Heftetjernite specimens
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Heftetjernite

    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • 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
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 3rd May 2013 14:15:26
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds