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Heftetjernite

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

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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
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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
Ti
 
2
ZrO
 
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

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    • 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. Bergverksmuseets Skrift (Norsk Bergverkmuseum), 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.
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