Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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
Black Mountain (Swartberg mine), Aggeneys, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa


Locality type:Mountain
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 Black Mountain (Swartberg mine), Aggeneys, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
Data Identifiers
Mindat Occurrence Record ID:1709366
Long-form Identifier:1:3:1709366:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
10.9km (6.8 miles) ⓘAggeneys, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
27.6km (17.2 miles) ⓘHotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
57.8km (35.9 miles) ⓘTantalite Valley, Karasburg East, ǁKaras Region, Namibia
78.9km (49.1 miles) ⓘNorabees I pegmatite, Norrabees pegmatites I-VI, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
80.2km (49.8 miles) ⓘNorrabees pegmatites I-VI, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
88.6km (55.1 miles) ⓘPutsberg, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
88.9km (55.3 miles) ⓘKoperberg Mine, Carolusberg, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
89.3km (55.5 miles) ⓘNarrap Mine, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
89.9km (55.9 miles) ⓘKliphoog Mine, Concordia, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
91.5km (56.8 miles) ⓘKokerboomrand pegmatite, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
References
Rudnick, Tarryn-Kim; Rozendaal, Abraham (2013) Genesis of the stratiform BH-t Swartberg Cu-Pb-Zn-Ag deposit, Northern Cape, South Africa.
Kim Cawood, Tarryn; Rozendaal, Abraham (2020) A Multistage Genetic Model for the Metamorphosed Mesoproterozoic Swartberg Base Metal Deposit, Aggeneys-Gamsberg Ore District, South Africa. Economic Geology, 115 (5). 1021-1054 doi:10.5382/econgeo.4725
 
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 6, 2026 11:08:59
Go to top of page