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

Magnetite from
Eagle Rock Mine, Boulder County Tungsten Mining District, Boulder County, Colorado, USA


Locality type:Mine
Classification
Species:Magnetite
Formula:Fe2+Fe23+O4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Magnetite data
Locality Data:Click here to view Eagle Rock Mine, Boulder County Tungsten Mining District, Boulder County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:725475
Long-form Identifier:1:3:725475:8
GUID (UUID V4):0
Nearest other occurrences of Magnetite
6.6km (4.1 miles) ⓘGreen Mountain kimberlite, Boulder County, Colorado, USA
18.0km (11.2 miles) ⓘCaribou Hill deposits, Caribou Mining District, Boulder County, Colorado, USA
18.5km (11.5 miles) ⓘMena Mine (Hoffmeister Homestead Prospect; Black Judge Shaft), Ralston Buttes Mining District, Jefferson County, Colorado, USA
23.3km (14.5 miles) ⓘEvergreen Mine (Gold Standard; Nancy Lee), Apex Mining District (Kingston Mining District; Pine Mining District), Gilpin County, Colorado, USA
29.4km (18.3 miles) ⓘRoscoe Placer, Lower Clear Creek Area, Clear Creek County, Colorado, USA
30.1km (18.7 miles) ⓘRoscoe Beryl Mine (Roscoe pegmatite), Clear Creek pegmatite Province, Jefferson County, Colorado, USA
32.2km (20.0 miles) ⓘStanley Mine (Gehrmann; Cooper; York; Whale; Golden Link), Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA
33.2km (20.6 miles) ⓘBeaver Brook pegmatite (Brandt pegmatite), Clear Creek pegmatite Province, Clear Creek County, Colorado, USA
37.2km (23.1 miles) ⓘF.M.D. Mine, Evergreen Mining District (Malachite Mining District), Jefferson County, Colorado, USA
43.8km (27.2 miles) ⓘJefferson County Iron Mines, Morrison Area, Jefferson County, Colorado, USA
References
USGS Bull 583
 
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 00:11:20
Go to top of page