Vote for your favorite mineral in #MinCup26! - Bournonite vs. Vesuvianite
Cogwheels of bournonite are up against colourful vesuvianite.
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
Forge Hill iron mines (Old Hawley iron mines), West Hawley, Hawley, Franklin County, Massachusetts, 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 Forge Hill iron mines (Old Hawley iron mines), West Hawley, Hawley, Franklin County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:29984
Long-form Identifier:1:3:29984:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.1km (2.5 miles) ⓘHawks Pyrite Mine (Mount Peak Mine), Charlemont, Franklin County, Massachusetts, USA
8.7km (5.4 miles) ⓘHoosac Tunnel Soapstone Quarry (Hoosac Talc Mine), Rowe, Franklin County, Massachusetts, USA
10.4km (6.5 miles) ⓘMary Louise Copper Mine, Rowe, Franklin County, Massachusetts, USA
10.6km (6.6 miles) ⓘDavis Pyrite Mine, Rowe, Franklin County, Massachusetts, USA
11.5km (7.1 miles) ⓘBetts Manganese Mines, Plainfield, Hampshire County, Massachusetts, USA
11.7km (7.3 miles) ⓘMassachusetts Talc Company Mine, Rowe, Franklin County, Massachusetts, USA
12.3km (7.7 miles) ⓘFoliated Talc Company Mine, Rowe, Franklin County, Massachusetts, USA
19.8km (12.3 miles) ⓘClark Ledge pegmatite locality, Chesterfield, Hampshire County, Massachusetts, USA
20.4km (12.7 miles) ⓘMount Greylock, Adams, Berkshire County, Massachusetts, USA
21.5km (13.3 miles) ⓘWhitingham, Windham County, Vermont, USA
References
"Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992
 
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 4, 2026 08:36:08
Go to top of page