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
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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
symbol to view information about a locality.
The 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).
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