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Epidote from
Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway


Locality type:Pegmatite
Classification
Species:Epidote
Formula:(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Comments:At Heftetjern epidote goup minerals appear as mm-sized plate-like, transparent crystals in in aggregates, and in varying colours. Premlininary studies (SEM-EDS ; Franx Bernard, see Raade & Kristiansen (2000) revealed that these are scandian or cerian epidotes.

Further studies showed that these are complex zonated, showing different chemistry of the epidote – allanite-(Ce) solid-solution series in the diffent zones in one single crystal.

Epidote has been found identified from an in an aggregate of allanite-(Ce) from the Heftetjern pegmatite with domains of heflikite (Pieczka et al. 2024, Fig 1 (g).
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Heflikite1
Titanite1
- var Triclinic Titanite1
Allanite-(Ce)1
Kristiansenite1
Hingganite-(Y)1
Data
Mineral Data:Click here to view Epidote data
Locality Data:Click here to view Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:169902
Long-form Identifier:1:3:169902:9
GUID (UUID V4):0
Nearest other occurrences of Epidote
13.2km (8.2 miles) ⓘVeneli Iron Prospect, Nissedal, Telemark, Norway
13.7km (8.5 miles) ⓘSøftestad Iron Mines, Søftestad, Nissedal, Telemark, Norway
30.8km (19.1 miles) ⓘGrave Copper Mine, Kviteseid, Telemark, Norway
33.1km (20.6 miles) ⓘListaulli Mine, Kviteseid, Telemark, Norway
36.2km (22.5 miles) ⓘLia Mine (Saude Mine), Akkerhaugen, Sauherad, Midt-Telemark, Telemark, Norway
36.9km (22.9 miles) ⓘGjerstadveien roadcut, Gjerstad, Agder, Norway
42.4km (26.4 miles) ⓘFikkjebakke, Sannidal, Kragerø, Telemark, Norway
45.2km (28.1 miles) ⓘKåseli prospect, Skien, Telemark, Norway
45.3km (28.1 miles) ⓘBreigangen Mine, Fossum Iron Mines, Skien, Telemark, Norway
45.8km (28.4 miles) ⓘLanggangen Mine, Fossum Iron Mines, Skien, Telemark, Norway
References
Raade, Gunnar, Kristiansen, Roy (2000) Mineralogy and geochemistry of the Heftetjern granite pegmatite, Tørdal: a progress report. Norsk Bergverksmuseum Skrift, 17. 19-25 as cerian/scandian epidote
Kristiansen, Roy (2018) Nye mineralfunn fra Heftetjern-pegmatitten i Tørdal [New mineral discoveries from the Heftetjern pegmatite in Tørdal]. Norsk Mineralsymposium 2018, 79-92
Pieczka, Adam, Kristiansen, Roy, Stachowicz, Marcin, Dumańska-Słowik, Magdalena, Gołębiowska, Bożena, Sęk, Mateusz P., Nejbert, Krzysztof, Kotowski, Jakub, Marciniak-Maliszewska, Beata, Szuszkiewicz, Adam, et al. (2024) Heflikite, ideally Ca2(Al2Sc)(Si2O7)(SiO4)O(OH), the first scandium epidote-supergroup mineral from Jordanów Śląski, Lower Silesia, Poland and from Heftetjern, Tørdal, Norway. Mineralogical Magazine, 88 (3). 228-243 doi:10.1180/mgm.2023.98
 
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