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


09111430017271948811181.jpg
Oftedalite

Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
09111430017271948811181.jpg
Oftedalite

Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
09111430017271948811181.jpg
Oftedalite

Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Locality type:Pegmatite
Classification
Species:Oftedalite
Formula:K◻2(ScCa)Be3[Si12O30]
Chemical Analyses:
Oxide wt%:
1
SiO273.32 %
Al2O30.47 %
Sc2O36.77 %
Y2O30.36 %
FeO0.26 %
MnO1.32 %
CaO4.49 %
K2O4.71 %
BeO7.41 %
Total:99.11 %
Empirical formulas:
1(Sc0.96Ca0.79Mn2+0.18Fe2+0.04)Σ2.00K0.98(Be2.91Al0.09)Σ3.0Si11.98O30
Sample references:
1Type Specimen
Cooper, M. A., Hawthorne, F. C., Ball, N. A., Černý, Petr, Kristiansen, Roy (2006) Oftedalite, (ScCa)KBe3Si12O30, a new mineral species of the milarite group from the Heftetjern pegmatite, Tørdal, Norway: description and crystal structure. The Canadian Mineralogist, 44 (4) 943-949 doi:10.2113/gscanmin.44.4.943
Comments:Found in only one sample !
Habit:hexagonale prismatic xls showing {100} and {001}
Colour:greyish white
Abundance at site:Extremely Rare
Confirmation
Validity:Valid - Type Locality
Associated Minerals:
Associates:Bazzite
Milarite
Tourmaline
Data
Mineral Data:Click here to view Oftedalite data
Locality Data:Click here to view Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:313051
Long-form Identifier:1:3:313051:3
GUID (UUID V4):0
References
Kristiansen, Roy (2005) Milarittgruppens mineraler i Norge [The minerals of the milarite group in Norway]. Norsk Bergverksmuseum Skrift, 30. 21-29
Cooper, M. A., Hawthorne, F. C., Ball, N. A., Černý, Petr, Kristiansen, Roy (2006) Oftedalite, (ScCa)KBe3Si12O30, a new mineral species of the milarite group from the Heftetjern pegmatite, Tørdal, Norway: description and crystal structure. The Canadian Mineralogist, 44 (4) 943-949 doi:10.2113/gscanmin.44.4.943
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
Chukanov, Nikita V.; Zubkova, Natalia V.; Kasatkin, Anatoly V.; Pekov, Igor V.; Agakhanov, Atali A.; Yapaskurt, Vasiliy O.; Virus, Alla A.; Ksenofontov, Dmitry A.; Britvin, Sergey N. (2026) Partial Ordering of Cations by the Wolframite Mechanism Using Fe2+- and Sc-Dominant Minerals of the Columbite Supergroup as Examples. Minerals, 16 (5). p.536. doi:10.3390/min16050536
NAGASHIMA, Mariko; NISHIO-HAMANE, Daisuke (2026) Crystal chemistry of uedaite-(Ce) from the Karasugawa mine, Fukushima, Japan, and the Heftetjern pegmatite, Norway. Journal of Mineralogical and Petrological Sciences, 121 (1). p.n/a. doi:10.2465/jmps.260125
 
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