Vote for your favorite mineral in #MinCup26! - Hafnon vs. Putnisite
It's a pair of tiny minerals of unusual chemistry as orange Hafnon battles with purple Putnisite.
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

Serpentine Subgroup from
Sugarloaf Butte, Cedar Mountain Mining District, Alameda County, California, USA


Locality type:Table/Butte
Classification
Species:'Serpentine Subgroup' (not an IMA approved species)
Formula:D3[Si2O5](OH)4
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Hydromagnesite
Data
Mineral Data:Click here to view Serpentine Subgroup data
Locality Data:Click here to view Sugarloaf Butte, Cedar Mountain Mining District, Alameda County, California, USA
Data Identifiers
Mindat Occurrence Record ID:681739
Long-form Identifier:1:3:681739:8
GUID (UUID V4):0
Nearest other occurrences of Serpentine Subgroup
2.4km (1.5 miles) ⓘMendenhall No. 1 Mine (Cedar Mountain Mine; Mendenhall Chrome Mines; Mendenhall Mine; Newman Mine), Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USA
2.7km (1.7 miles) ⓘCedar Mountain Magnesite Mine, Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USA
6.2km (3.9 miles) ⓘJones prospect, Lookout Point, Cedar Mountain Mining District, Alameda County, California, USA
17.9km (11.1 miles) ⓘWinship Mine, Red Mountain, Black Wonder Mining District, Santa Clara County, California, USA
19.6km (12.2 miles) ⓘRed Mountain Mine, Red Mountain, Black Wonder Mining District, Stanislaus County, California, USA
20.0km (12.4 miles) ⓘWestern Magnesite Company Mine, Red Mountain, Black Wonder Mining District, Santa Clara County, California, USA
20.8km (12.9 miles) ⓘBlack Bart Mine group, Red Mountain, Black Wonder Mining District, Stanislaus County, California, USA
22.9km (14.2 miles) ⓘPlatner prospect, Red Mountain, Black Wonder Mining District, Stanislaus County, California, USA
23.0km (14.3 miles) ⓘLucky Girl Mine (Stanislaus Mine), Black Mountain, Black Wonder Mining District, Stanislaus County, California, USA
23.3km (14.4 miles) ⓘNumber Five group (Number 5 group; No. 5 Mine; Mineral Products Company property), Copper Mountain, Black Wonder Mining District, Stanislaus County, California, USA
References
Kramm, H.E. (1910), Serpentines of the central Coast Ranges of California: American Philosophical Society Proceedings: 49: 344
Rogers, Austin Flint (1923b), The crystallography of hydromagnesite: American Journal of Science, 5th. Series: 6: 38
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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 9, 2026 01:25:50
Go to top of page