Vote for your favorite mineral in #MinCup26! - Arsenuranylite vs. Talc
It's a pair of soft and lovely minerals as Stichtite and Talc compete for 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

Magnesite from
Fort Point, San Francisco, San Francisco County, California, USA


Locality type:Point
Classification
Species:Magnesite
Formula:MgCO3
Comments:Occurs as seams in serpentine.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Serpentine Subgroup
Data
Mineral Data:Click here to view Magnesite data
Locality Data:Click here to view Fort Point, San Francisco, San Francisco County, California, USA
Data Identifiers
Mindat Occurrence Record ID:686099
Long-form Identifier:1:3:686099:8
GUID (UUID V4):0
Nearest other occurrences of Magnesite
72.6km (45.1 miles) ⓘHayes Ranch deposit, Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USA
77.1km (47.9 miles) ⓘUnnamed Magnesite occurrence [2], Spanish Flat, Napa County, California, USA
79.1km (49.2 miles) ⓘUnnamed Magnesite deposit [1], Chiles Valley (Chile Valley), Spanish Flat, Napa County, California, USA
79.5km (49.4 miles) ⓘMaltby No. 2 Mine (Blanco and Snowflake Mine), Spanish Flat, Napa County, California, USA
79.6km (49.5 miles) ⓘHillsdale Mine (Chaboya-Hillsdale Mine; San Juan Bautista Mine; San Juan Mine; San Juan Quicksilver Mine; Sheboya Mine; Chapman Mine; Oak Hill Mine), Oak Hill, San Jose, Santa Clara County, California, USA
79.7km (49.6 miles) ⓘElder Mine (Matthai Mine; Cleveland Mine; Detert Mine), Spanish Flat, Napa County, California, USA
79.7km (49.6 miles) ⓘCedar Mountain Magnesite Mine, Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USA
80.0km (49.7 miles) ⓘSoda Valley, Spanish Flat, Napa County, California, USA
80.2km (49.8 miles) ⓘBerthenia Mine, Spanish Flat, Napa County, California, USA
81.7km (50.8 miles) ⓘUnnamed Magnesite occurrence [1], Sugarloaf Butte, Cedar Mountain Mining District, Alameda County, California, USA
References
with chemical analyses by W.T. Schaller: University of California, Department of Geological Science Bulletin: 2: 316
Eakle, Arthur Starr (1901), Mineralogical notes
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 249.
 
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 8, 2026 01:53:24
Go to top of page