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
Byrud Emerald Mines, Minnesund, Eidsvoll, Akershus, Norway


Locality type:Mine
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Byrud Emerald Mines, Minnesund, Eidsvoll, Akershus, Norway
Data Identifiers
Mindat Occurrence Record ID:484334
Long-form Identifier:1:3:484334:4
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
15.6km (9.7 miles) ⓘTangen Mn Mine, Hurdalsjøen, Nannestad, Akershus, Norway
25.2km (15.7 miles) ⓘMidtmoen, Øståsen, Lunner, Akershus, Norway
40.3km (25.0 miles) ⓘGjerdingselva, Lunner, Akershus, Norway
43.6km (27.1 miles) ⓘDelebekken Roadcut, Oslomarka, Oslo, Norway
45.3km (28.1 miles) ⓘBjørkåsen Quarry, Grue, Innlandet, Norway
53.1km (33.0 miles) ⓘHuken Quarry, Grorud, Oslo, Norway
89.1km (55.3 miles) ⓘElgskauåsen tunnel, Røyken, Asker, Akershus, Norway
95.2km (59.2 miles) ⓘKleivene tunnel E18, Austad-Fjell, Drammen, Buskerud, Norway
96.1km (59.7 miles) ⓘE 134 Road, Drammen, Buskerud, Norway
References
Nordrum, Fred Steinar, Raade, Gunnar (2006) The Emerald deposit at Byrud, Eidsvoll, South Norway. Norsk Bergverksmuseum Skrift, 33. 9-16
 
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