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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Stilpnomelane from
Valberg Quarry, Valberg, Kragerø, Telemark, Norway


Locality type:Quarry
Classification
Species:Stilpnomelane
Formula:K4Fe482+[Si64Al8]O164(OH)52 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilpnomelane data
Locality Data:Click here to view Valberg Quarry, Valberg, Kragerø, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:560768
Long-form Identifier:1:3:560768:6
GUID (UUID V4):0
Nearest other occurrences of Stilpnomelane
30.2km (18.8 miles) ⓘJohs Nilsens Quarry, Tvedalen, Larvik Commune, Vestfold, Norway
31.2km (19.4 miles) ⓘE18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway
32.4km (20.1 miles) ⓘKjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway
40.3km (25.0 miles) ⓘBreigangen Mine, Fossum Iron Mines, Skien, Telemark, Norway
43.5km (27.0 miles) ⓘHedrum Quarry, Lågendalen, Hedrum, Larvik Commune, Vestfold, Norway
45.7km (28.4 miles) ⓘBratthagen 1, Lågendalen, Hedrum, Larvik Commune, Vestfold, Norway
50.8km (31.6 miles) ⓘHeftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway
53.8km (33.4 miles) ⓘHusebyåsen prospect, Vesterøya, Sandefjord, Vestfold, Norway
53.8km (33.4 miles) ⓘBuer, Vesterøya, Sandefjord, Vestfold, Norway
54.0km (33.6 miles) ⓘVindalsvingen, Vindal, Vesterøya, Sandefjord, Vestfold, Norway
References
Nordrum, Fred Steinar (2000) Ni, Co-mineralizations in the Valberg quarry, Kragerø, South Norway: a progress report. Norsk Bergverksmuseum Skrift, 17. 64-70
 
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