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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Montmorillonite from
Elgskauåsen tunnel, Røyken, Asker, Akershus, Norway


Locality type:Tunnel
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Elgskauåsen tunnel, Røyken, Asker, Akershus, Norway
Data Identifiers
Mindat Occurrence Record ID:558558
Long-form Identifier:1:3:558558:8
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
12.7km (7.9 miles) ⓘKleivene tunnel E18, Austad-Fjell, Drammen, Buskerud, Norway
18.4km (11.4 miles) ⓘE 134 Road, Drammen, Buskerud, Norway
23.3km (14.5 miles) ⓘHanekleiva tunnel, Kjeksrød, Holmestrand, Vestfold, Norway
29.3km (18.2 miles) ⓘSolumsåsen Quarry, Holmestrand, Vestfold, Norway
30.4km (18.9 miles) ⓘHaslestad Quarry, Hof, Holmestrand, Vestfold, Norway
37.3km (23.2 miles) ⓘHuken Quarry, Grorud, Oslo, Norway
44.7km (27.8 miles) ⓘHimberg Quarry, Ramnes, Tønsberg, Vestfold, Norway
45.9km (28.5 miles) ⓘDelebekken Roadcut, Oslomarka, Oslo, Norway
48.1km (29.9 miles) ⓘFrodeåsen Tunnel, Tønsberg, Vestfold, Norway
51.8km (32.2 miles) ⓘHoltehædde, Hedrum, Larvik Commune, Vestfold, Norway
References
Nordrum, Fred Steinar (1999) Nyfunn av mineraler 1998-1999 [News of mineral finds 1998-1999]. Norsk Bergverksmuseum Skrift, 15. 87-90
 
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