Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Helvine from
Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway


Locality type:Pegmatite
Classification
Species:Helvine
Formula:Be3Mn42+(SiO4)3S
Comments:Occurs as intimately intergrowth with light blue bazzite. Raade & Kristiansen 2000 found a scandian-rich helvite with up to 1,7 % Sc2O3
Habit:irregular masses several cm across; irregular grains
Colour:pinkish; deep brown-red
Abundance at site:Very Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Helvine data
Locality Data:Click here to view Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:558582
Long-form Identifier:1:3:558582:3
GUID (UUID V4):0
Nearest other occurrences of Helvine
45.3km (28.1 miles) ⓘBreigangen Mine, Fossum Iron Mines, Skien, Telemark, Norway
55.9km (34.7 miles) ⓘKjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway
56.0km (34.8 miles) ⓘRamsåskollen, Skien, Telemark, Norway
56.1km (34.8 miles) ⓘE18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway
56.7km (35.3 miles) ⓘRønningen E 18 roadcuts, Porsgrunn, Telemark, Norway
57.3km (35.6 miles) ⓘBuer, Bjørkedalen, Porsgrunn, Telemark, Norway
59.4km (36.9 miles) ⓘKokkersvold, Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
59.6km (37.0 miles) ⓘFerry Quay, Bjørkøya, Porsgrunn, Telemark, Norway
60.5km (37.6 miles) ⓘChiavennite dike, Blåfjell (E18 roadcuts), Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
61.5km (38.2 miles) ⓘTangane, Siktesøya, Porsgrunn, Telemark, Norway
References
Raade, Gunnar, Erambert, Muriel (1999) An intergrowth of scandiobabingtonite and cascandite from the Heftetjern granite pegmatite, Norway. Neues Jahrbuch für Mineralogie - Monatshefte, 1999 (12) 545-550
Raade, Gunnar, Kristiansen, Roy (2000) Mineralogy and geochemistry of the Heftetjern granite pegmatite, Tørdal: a progress report. Norsk Bergverksmuseum Skrift, 17. 19-25
Raade, Gunnar (2020) Helvine-group minerals from Norwegian granitic pegmatites and some other granitic rocks: Cases of significant Sc and Sn contents. The Canadian Mineralogist, 58 (3). 367-379 doi:10.3749/canmin.1900099
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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