Heftetjernite
A valid IMA mineral species
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About Heftetjernite
The famous Heftetjern pegmatite - June 2008
Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Formula:
ScTaO4
Colour:
Very dark brown (to greenish brown in part)
Lustre:
Adamantine
Hardness:
4½
Crystal System:
Monoclinic
Member of:
Name:
Named by U. Kolitsch, R. Kristiansen, G. Raade, and E. Tillmanns in 2006 after the type locality of Heftetjern pegmatite, Norway.
Type Locality:
Wolframite Group.
The Ta analogue of nioboheftetjernite. Also known as a synthetic compound since the 1960s.
See http://www.mindat.org/mesg-55-113507.html for a warning on wrongly identified specimens sold on the mineral market.
The Ta analogue of nioboheftetjernite. Also known as a synthetic compound since the 1960s.
See http://www.mindat.org/mesg-55-113507.html for a warning on wrongly identified specimens sold on the mineral market.
Unique Identifiers
Mindat ID:
38788
Long-form identifier:
mindat:1:1:38788:0
GUID
(UUID V4):
(UUID V4):
ab0b219f-e1a5-4924-9bd0-8f58f222a2ca
IMA Classification of Heftetjernite
Classification of Heftetjernite
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
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
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Hef | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Heftetjernite
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}
{010}
Fracture:
Irregular/Uneven
Optical Data of Heftetjernite
Type:
Biaxial
Chemistry of Heftetjernite
Mindat Formula:
ScTaO4
Elements listed:
Crystallography of Heftetjernite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/c
Cell Parameters:
a = 4.784 Å, b = 5.693 Å, c = 5.120 Å
β = 91.15°
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.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0007337 | Heftetjernite | Kolitsch U, Kristiansen R, Raade G, Tillmanns E (2010) Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tordal, Norway European Journal of Mineralogy 22 309-316 | 2010 | the Heftetjern pegmatite, Tordal, Norway | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.783 Å | (33) |
3.807 Å | (32) |
3.662 Å | (53) |
3.000 Å | (100) |
2.957 Å | (97) |
2.4877 Å | (34) |
1.7639 Å | (27) |
1.7157 Å | (22) |
Comments:
Calculated data.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
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).
Place of Conservation of Type Material:
Department of Geology, Natural History Museum, University of Oslo, Norway, # 41726.
Geological Setting of Type Material:
Cleavelandite-amazonite pegmatite.
Associated Minerals at Type Locality:
Synonyms of Heftetjernite
Relationship of Heftetjernite to other Species
Member of:
Other Members of this group:
Dmitryvarlamovite | Ti2(Fe3+Nb)O8 | Orth. 2 2 2 : P21 21 2 |
Ferberite | FeWO4 | Mon. 2/m : P2/b |
Huanzalaite | MgWO4 | Mon. 2/m : P2/b |
Hübnerite | MnWO4 | Mon. 2/m : P2/b |
Krasnoselskite | CoWO4 | Mon. |
Nioboheftetjernite | ScNbO4 | Mon. 2/m : P21/b |
Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 | Mon. 2/m : P2/b |
Sanmartinite | (Zn,Fe)WO4 | Mon. 2/m : P21/b |
Related Minerals - Strunz-mindat Grouping
4.DB. | Nioboheftetjernite | ScNbO4 |
4.DB. | Shakhdaraite-(Y) | ScYNb2O8 |
4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
4.DB. | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
4.DB.05 | Argutite | GeO2 |
4.DB.05 | Cassiterite | SnO2 |
4.DB.05 | Plattnerite | PbO2 |
4.DB.05 | Pyrolusite | Mn4+O2 |
4.DB.05 | Rutile | TiO2 |
4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
4.DB.05 | Tugarinovite | MoO2 |
4.DB.05 | Varlamoffite | (Sn,Fe)(O,OH)2 |
4.DB.10 | Byströmite | MgSb2O6 |
4.DB.10 | Tapiolite-(Fe) | Fe2+Ta2O6 |
4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
4.DB.10 | Ordoñezite | ZnSb2O6 |
4.DB.10 | Tredouxite | NiSb2O6 |
4.DB.15b | Akhtenskite | ε-Mn4+O2 |
4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
4.DB.15a | Paramontroseite | V4+O2 |
4.DB.15a | Ramsdellite | Mn4+O2 |
4.DB.20 | Scrutinyite | α-PbO2 |
4.DB.25 | Ishikawaite | U4+Fe2+Nb2O8 |
4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
4.DB.25 | Srilankite | ZrTi2O6 |
4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
4.DB.30 | Ferberite | FeWO4 |
4.DB.30 | Hübnerite | MnWO4 |
4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
4.DB.30 | Krasnoselskite | CoWO4 |
4.DB.30 | Huanzalaite | MgWO4 |
4.DB.30 va | Wolframite Group | |
4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
4.DB.40 | Lithiotantite | LiTa3O8 |
4.DB.40 | Lithiowodginite | LiTa3O8 |
4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
4.DB.40 | Wolframowodginite | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
4.DB.45 | Tivanite | V3+TiO3(OH) |
4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
4.DB.55 | Alumotantite | AlTaO4 |
4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
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.
Internet Links for Heftetjernite
mindat.org URL:
https://www.mindat.org/min-38788.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Heftetjernite
Reference List:
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 (9) 888-890 doi:10.1107/s0365110x63002395
Kristiansen, Roy (2009) A unique assemblage of Scandium-bearing minerals from the Heftetjern-pegmatite, Tørdal, south Norway. Norsk Bergverksmuseum Skrift, 41. 75-104
Kolitsch, Uwe, Kristiansen, Roy, Raade, Gunnar, Tillmanns, Ekkehart (2010) Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tordal, Norway. European Journal of Mineralogy, 22 (2) 309-316 doi:10.1127/0935-1221/2010/0022-1987
Kristiansen, Roy (2010) Heftetjernitt og triklin titanitt fra Heftetjern i Tørdal. STEIN. Magasin for populærgeologi, 37 (4) 20-22
Localities for Heftetjernite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Norway (TL) | |
| Kristiansen (2009) +2 other references |
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Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway