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
Kleivene tunnel E18, Austad-Fjell, Drammen, Buskerud, 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 Kleivene tunnel E18, Austad-Fjell, Drammen, Buskerud, Norway
Data Identifiers
Mindat Occurrence Record ID:568305
Long-form Identifier:1:3:568305:5
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
6.1km (3.8 miles) ⓘE 134 Road, Drammen, Buskerud, Norway
12.7km (7.9 miles) ⓘElgskauåsen tunnel, Røyken, Asker, Akershus, Norway
17.8km (11.1 miles) ⓘHanekleiva tunnel, Kjeksrød, Holmestrand, Vestfold, Norway
24.0km (14.9 miles) ⓘHaslestad Quarry, Hof, Holmestrand, Vestfold, Norway
29.1km (18.1 miles) ⓘSolumsåsen Quarry, Holmestrand, Vestfold, Norway
44.3km (27.5 miles) ⓘHimberg Quarry, Ramnes, Tønsberg, Vestfold, Norway
46.0km (28.6 miles) ⓘHuken Quarry, Grorud, Oslo, Norway
47.0km (29.2 miles) ⓘHoltehædde, Hedrum, Larvik Commune, Vestfold, Norway
49.4km (30.7 miles) ⓘFrodeåsen Tunnel, Tønsberg, Vestfold, Norway
51.7km (32.1 miles) ⓘDelebekken Roadcut, Oslomarka, Oslo, Norway
References
Nordrum, Fred Steinar (2007) Nyfunn av mineraler i Norge 2006-2007. STEIN. Nordisk magasin for populær geologi, 34 (2) 14-26
 
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