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
Haslestad Quarry, Hof, Holmestrand, Vestfold, Norway


Locality type:Quarry
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 Haslestad Quarry, Hof, Holmestrand, Vestfold, Norway
Data Identifiers
Mindat Occurrence Record ID:570368
Long-form Identifier:1:3:570368:5
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
7.1km (4.4 miles) ⓘHanekleiva tunnel, Kjeksrød, Holmestrand, Vestfold, Norway
14.5km (9.0 miles) ⓘSolumsåsen Quarry, Holmestrand, Vestfold, Norway
23.1km (14.4 miles) ⓘHoltehædde, Hedrum, Larvik Commune, Vestfold, Norway
24.0km (14.9 miles) ⓘKleivene tunnel E18, Austad-Fjell, Drammen, Buskerud, Norway
24.6km (15.3 miles) ⓘHimberg Quarry, Ramnes, Tønsberg, Vestfold, Norway
25.5km (15.9 miles) ⓘE 134 Road, Drammen, Buskerud, Norway
30.4km (18.9 miles) ⓘElgskauåsen tunnel, Røyken, Asker, Akershus, Norway
31.4km (19.5 miles) ⓘFrodeåsen Tunnel, Tønsberg, Vestfold, Norway
39.7km (24.7 miles) ⓘBratthagen 3 hillside pegmatites, Lågendalen, Hedrum, Larvik Commune, Vestfold, Norway
39.8km (24.7 miles) ⓘBratthagen 2, Lågendalen, Hedrum, Larvik Commune, Vestfold, Norway
References
Larsen, Stig (2004) Ametyst fra Haslestad bruk. STEIN. Nordisk magasin for populær geologi, 31 (2) 4-5
 
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