Vote for your favorite mineral in #MinCup26! - Monazite-(Ce) vs. Andalusite
It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Montmorillonite from
The Thorite Hole, Løvøya, Porsgrunn, Telemark, Norway


Locality type:Pegmatite
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Comments:A green claylike mineral, described by Brøgger (1890) as "Steinmark", probably kaolinite? or montmorillonite pseudomorph after nepheline, was found by him and H. Reusch during their visit to the thorite TL in 1874.
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view The Thorite Hole, Løvøya, Porsgrunn, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:1015197
Long-form Identifier:1:3:1015197:8
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
5.3km (3.3 miles) ⓘTorbjørnsås Quarry, Auenlandet, Porsgrunn, Telemark, Norway
5.5km (3.4 miles) ⓘSagåsen Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway
6.5km (4.0 miles) ⓘParadisbukta, Store Arøya (Arøy), Larvik Commune, Vestfold, Norway
6.9km (4.3 miles) ⓘJohs Nilsens Quarry, Tvedalen, Larvik Commune, Vestfold, Norway
7.2km (4.5 miles) ⓘA/S Granit Quarry, Tuften, Tvedalen, Larvik Commune, Vestfold, Norway
7.3km (4.5 miles) ⓘVevja 2 Quarry, Tvedalen, Larvik Commune, Vestfold, Norway
9.0km (5.6 miles) ⓘØstskogen Quarry, Tvedalen, Larvik Commune, Vestfold, Norway
9.1km (5.7 miles) ⓘUtklev Quarry, Tvedalen, Larvik Commune, Vestfold, Norway
10.6km (6.6 miles) ⓘDragehullet, Torsberg, Flakvarp, Skien, Telemark, Norway
12.1km (7.5 miles) ⓘMelau 2 Quarry, Brunlanes, Larvik Commune, Vestfold, Norway
References
Brøgger, Waldemar Christofer (1890) Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit- und Nephelinsyenite. Zeitschrift für Krystallographie und Mineralogie, 16 (1). 1-893p.199
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 7, 2026 10:28:16
Go to top of page