Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Biotite from
Grover Mine (Grover pegmatite; Windsor), Clear Creek County, Colorado, USA


Locality type:Mine
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 Grover Mine (Grover pegmatite; Windsor), Clear Creek County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:354928
Long-form Identifier:1:3:354928:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.6km (2.2 miles) ⓘAjax Mica Mine (Floyd Hill Mica Mine), Clear Creek Pegmatite Province, Clear Creek County, Colorado, USA
5.7km (3.6 miles) ⓘMt. Judge Beryl Pegmatite, Clear Creek Pegmatite Province, Clear Creek County, Colorado, USA
6.4km (4.0 miles) ⓘHiwan Ranch, Clear Creek Pegmatite Province, Jefferson County, Colorado, USA
6.5km (4.0 miles) ⓘOld Soda Creek School Pegmatite, Clear Creek Pegmatite Province, Jefferson County, Colorado, USA
8.0km (4.9 miles) ⓘHudson Tunnel, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
8.5km (5.3 miles) ⓘRoscoe Beryl Mine (Roscoe pegmatite), Clear Creek pegmatite Province, Jefferson County, Colorado, USA
9.2km (5.7 miles) ⓘWaterloo Mine, Russell Gulch, Gilpin County, Colorado, USA
10.0km (6.2 miles) ⓘBurlington - Iowa Group, Central City Mining District (Central Mining District), Gilpin County, Colorado, USA
10.2km (6.4 miles) ⓘDevils Canyon, Clear Creek County, Colorado, USA
10.6km (6.6 miles) ⓘHosa Lodge Mine, Evergreen Mining District (Malachite Mining District), Jefferson County, Colorado, USA
References
Hanley, J.B., Heinrich, E.W., Page, L.R. (1950) Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944. Professional Paper 227. US Geological Survey doi:10.3133/pp227
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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: October 21, 2026 16:42:31
Go to top of page