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

Chalcedony from
Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
Data Identifiers
Mindat Occurrence Record ID:148282
Long-form Identifier:1:3:148282:9
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
3.8km (2.4 miles) ⓘLone Hill Quarry (Mirasson Brothers Quarry), Lone Hill, San Jose, Santa Clara County, California, USA
6.5km (4.0 miles) ⓘNew Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA
15.8km (9.8 miles) ⓘTilton Ranch (California-Nevada Quicksilver Mining Company; Coyote), Coyote, Coyote Mining District, Santa Clara County, California, USA
24.4km (15.1 miles) ⓘAnderson Lake, Cochrane Ranch (Cochran Ranch) area, Cochrane Ranch (Cochran Ranch; Jackson Ranch), Morgan Hill, Santa Clara County, California, USA
43.7km (27.2 miles) ⓘKelley prospect, Red Mountain, Black Wonder Mining District, Santa Clara County, California, USA
45.8km (28.5 miles) ⓘPescadero Beach Mine, Pescadero, San Mateo County, California, USA
49.4km (30.7 miles) ⓘLa Vista Quarry, Hayward, Alameda County, California, USA
64.1km (39.8 miles) ⓘComstock Mine, Pacheco Peak, Stayton Mining District (McLeod Mining District; Panoche Mining District), Santa Clara County, California, USA
77.9km (48.4 miles) ⓘUnited States Mint site, Duboce Street near Market Street, San Francisco, San Francisco County, California, USA
78.4km (48.7 miles) ⓘUnnamed gemstone occurrence [1], Berkeley, Alameda County, California, USA
References
Rocks & Minerals (1944): 19: 346-347
Rocks & Minerals (1948): 23: 797.
 
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 15:38:33
Go to top of page