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
Kjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway


Locality type:Road Cutting
Classification
Species:Helvine
Formula:Be3Mn42+(SiO4)3S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Helvine data
Locality Data:Click here to view Kjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:416663
Long-form Identifier:1:3:416663:4
GUID (UUID V4):0
Nearest other occurrences of Helvine
1.4km (0.9 miles) ⓘE18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway
2.3km (1.4 miles) ⓘRønningen E 18 roadcuts, Porsgrunn, Telemark, Norway
3.2km (2.0 miles) ⓘRamsåskollen, Skien, Telemark, Norway
4.7km (2.9 miles) ⓘBuer, Bjørkedalen, Porsgrunn, Telemark, Norway
4.8km (3.0 miles) ⓘKokkersvold, Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
5.9km (3.7 miles) ⓘChiavennite dike, Blåfjell (E18 roadcuts), Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
10.3km (6.4 miles) ⓘEikevegåsen Quarry, Bassebu, Porsgrunn, Telemark, Norway
11.1km (6.9 miles) ⓘFerry Quay, Bjørkøya, Porsgrunn, Telemark, Norway
11.5km (7.1 miles) ⓘSagåsen Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway
11.5km (7.2 miles) ⓘSaga 1 Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway
References
(n.d.) Knut Eldjarn collection.
 
and/or  
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