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!
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

Biotite from
Chlum Hill, Sepekov, Písek District, South Bohemian Region, Czech Republic


Locality type:Hill
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Chlum Hill, Sepekov, Písek District, South Bohemian Region, Czech Republic
Data Identifiers
Mindat Occurrence Record ID:648005
Long-form Identifier:1:3:648005:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
22.0km (13.7 miles) ⓘStaré Hory deposit, Ratibořské Hory, Tábor District, South Bohemian Region, Czech Republic
22.1km (13.7 miles) ⓘU obrázku quarry (Obrázek I quarry), Písek District, South Bohemian Region, Czech Republic
26.1km (16.2 miles) ⓘCihelný vrch Hill, Sedlčany, Sedlčany, Příbram District, Central Bohemian Region, Czech Republic
27.6km (17.2 miles) ⓘPacova Hill quarry, Dolní Hořice, Tábor District, South Bohemian Region, Czech Republic
37.0km (23.0 miles) ⓘMokrsko-West gold deposit (Mokrsko Au deposit), Mokrsko, Chotilsko, Psí hory gold mining district, Příbram District, Central Bohemian Region, Czech Republic
51.6km (32.1 miles) ⓘMalenice almandine occurrence, Malenice, Strakonice District, South Bohemian Region, Czech Republic
53.5km (33.3 miles) ⓘKobylí hora quarry, Prachatice, Prachatice District, South Bohemian Region, Czech Republic
54.5km (33.9 miles) ⓘNová Ves pegmatite, Nová Ves, Český Krumlov District, South Bohemian Region, Czech Republic
55.9km (34.7 miles) ⓘNedabyle quarry, Nedabyle, České Budějovice District, South Bohemian Region, Czech Republic
57.6km (35.8 miles) ⓘRadvanka quarry, Hejná, Klatovy District, Plzeň Region, Czech Republic
References
Fiala, J., Losert, J.: Nález korundu, cordieritu, granátu, sillimanitu a turmlínu v hercynitovcích na Chlumu u Sepekova. Časopis pro mineralogii a geologii, 1976, roč. 21, č. 3, s. 326.
 
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 3, 2026 12:17:18
Go to top of page