Norsk versjon
THE INDUSTRIAL MINERAL DATABASE
Occurence 4016 - 305 Heftetjern
(Object Id: 8495)
(Last updated: 12.02.2025)
Belongs to the Province: Tørdal pegmatittprovins
Location
County: Telemark Municipality: Drangedal (4016)
Map 1:50000: Nissedal (1613-3) Map 1:250000: Skien
Coordinate system: EU89-UTM Zone 32
East: 485523 m. North: 6560371 m.
Longitude: 8.7466800 Latitude: 59.1822300
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Resource
Resource Type: Feldspar Resource Subtype: Pegmatitic feldspar

Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Open pit mining Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Pegmatitic feldspar % 15.10.2024

Operations
From - To Activity Comments
2011 - 2012 Detail mapping
2011 - 2012 Sampling
2012 - 2012 Geochemistry Company/Institution :Scandium International Mining Corp.

Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province: South Norwegian Basement Province
Geotec.unit: Telemark Supergroup
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Free text
Forekomsten er en ca. 300m lang og 5-40 meter mektig pegmatitt. Den er funnstedet for en rekkeskjelde ccandium og beryllium mineraler. Følgende mineraler er orginalbeskrevet fra lokaliteten: kristiansenitt, heftetjernitt, agakhanovitt og helflikitt

Bibliography:
From NGU's Reference Archive:
Bergstøl, S.; Juve, G. , 1988
Scandian ixiolite, pyrochlore and bazzite in granite pegmatite in Tørdal, Telemark, Norway. A contribution to the mineralogy and geochemistry of scandium and tin.
;Springer-Verlag;TIDSSKRIFTARTIKKEL;Mineralogy and petrology; No.38;229-243 pages
Abstract:
In Tørdal granite pegmatite veins cut through a volcano-sedimentary sequence which overlies an older, gneissic basement and younger granite from which they originate. Positive co-variations of scandium, lithium, beryllium and tin, which were documented through a recent prospecting program for tin, indicate a possible enrichment of scandium and tin during the passage of pegmatitic material through the volcanic sedimentary sequence. A description is given of scandium-rich ixiolite, (Ta,Nb,Sc,Sn,Fe,Mn,Ti)2O4 in association with pyrochlore, (Ca,Sc,Y,Sn,U)2(Ta,Nb,Ti)2O6(O,OH,F) and bazzite, Be3Sc2Si6O18 from a cleavelandite-amazonite pegmatite occurring as a part of a larger network of granitic pegmatite veins. Alteration from ixiolite to pyrochlore appears as a late magmatic-hydrothermal event.

Segalstad, Tom V.; Eggleston, Ted L. , 1993
Pegmatittene i Tørdal, Telemark.
;TIDSSKRIFTARTIKKEL;Stein; No.20 (3);190-195 pages

Oftedal, Ivar , 1943
Lepidolit- og tinnsteinførende pegmatitt i Tørdal, Telemark
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.22 (1-2);1-14 pages

Larsen, Alf Olav , 2025
Pegmatittbrudd i Telemark
;BOK;212 s. pages

Raade, Gunnar , 2010
Plumbomicrolite from the Heftetjern granitic pegmatite, Tørdal, Telemark, south Norway
;Norsk Bergverksmuseum;TIDSSKRIFTARTIKKEL;Norsk Bergverksmuseums skriftserie; No.43-10;21-28 pages
Abstract:

References not to be found in NGU's Reference Archive.:
Steffenssen, G., Muller, A., Munnik, F., Friis, H., Erambert, M., Kristofferse, M., Rosing-Schow, N., 2020. Unusual scandium enrichments of the Tordal pegmatites, south Norway. Part I: Garnet as Sc exploration pathfinder. Ore Geology Reviews 126.


Segalstad, T.V., Raade, G., 2003. Scandium mineralizations in southern Norway – geological background for the field trip. NGF Abstracts and Proceedings, No 2, p. 57-86.

The fact sheet was created on 13.07.2025
Questions or comments regarding the fact sheet can be emailed to:
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