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
Getchell Mountain pegmatite prospect, Lakeville, Penobscot County, Maine, USA


Locality type:Prospect
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 Getchell Mountain pegmatite prospect, Lakeville, Penobscot County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:360272
Long-form Identifier:1:3:360272:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
61.3km (38.1 miles) ⓘRogers Farm Zone (St. Stephen Ni-Co-Cu Deposit), Saint Stephen Parish, Charlotte Co., New Brunswick, Canada
82.5km (51.3 miles) ⓘCatherine Mountain Molybdenite prospect, Catherine Mountain, T10 SD, Hancock County, Maine, USA
83.5km (51.9 miles) ⓘClarence Stream Gold Deposit, Clarence Stream area, York Co., New Brunswick, Canada
87.7km (54.5 miles) ⓘFranklin Extension Mine, Franklin, Hancock County, Maine, USA
88.1km (54.7 miles) ⓘT. M. Blaisdell Granite Quarry, Franklin, Hancock County, Maine, USA
88.6km (55.1 miles) ⓘKatahdin Iron Works Mine, Katahdin Iron Works, Piscataquis County, Maine, USA
93.4km (58.1 miles) ⓘSullivan & Waukeag Mine, Sullivan Silver mines, Sullivan Mining District, Sullivan, Hancock County, Maine, USA
96.6km (60.0 miles) ⓘLake George Antimony mine (Consolidated Durham mines; Resources Ltd. mine; Prince William mine; Brunswick mine), Lake George, Prince William Parish, York Co., New Brunswick, Canada
97.0km (60.3 miles) ⓘGouldsborough Mine (Gouldsboro Mine), Gouldsboro, Hancock County, Maine, USA
97.4km (60.6 miles) ⓘMount Pleasant Mine, Saint George Parish, Charlotte Co., New Brunswick, Canada
References
Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
 
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 16:57:11
Go to top of page