Vote for your favorite mineral in #MinCup26! - Cuprite vs. Orpiment
It's a fiery match of vibrant red Cuprite and just as saturated orange Orpiment battle 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

Cummingtonite from
Newark Group, Unorganized mining district [1], Custer County, South Dakota, USA


Classification
Species:Cummingtonite
Formula:◻Mg2Mg5(Si8O22)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Cummingtonite data
Locality Data:Click here to view Newark Group, Unorganized mining district [1], Custer County, South Dakota, USA
Data Identifiers
Mindat Occurrence Record ID:383148
Long-form Identifier:1:3:383148:9
GUID (UUID V4):0
Nearest other occurrences of Cummingtonite
38.6km (24.0 miles) ⓘGolden West Mine (Benedict Property), Rochford Mining District, Pennington County, South Dakota, USA
39.4km (24.5 miles) ⓘBlack Eagle Mine (Blair Group), Rochford Mining District, Pennington County, South Dakota, USA
40.5km (25.2 miles) ⓘKing of the West (North Star), Rochford Mining District, Pennington County, South Dakota, USA
42.6km (26.5 miles) ⓘStandby mine, Rochford Mining District, Pennington County, South Dakota, USA
42.9km (26.7 miles) ⓘMary Belle Mine, Rochford Mining District, Pennington County, South Dakota, USA
43.6km (27.1 miles) ⓘGold King Mine (Gordelia Mine), Rochford Mining District, Pennington County, South Dakota, USA
44.1km (27.4 miles) ⓘMontezuma Mine (Montezuma Nos. 3 to 7; Red Jim; New Montezuma), Rochford Mining District, Pennington County, South Dakota, USA
47.1km (29.3 miles) ⓘMontana Mine, Rochford Mining District, Lawrence County, South Dakota, USA
69.0km (42.9 miles) ⓘHomestake Mine, Lead, Lead Mining District, Lawrence County, South Dakota, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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 5, 2026 05:29:09
Go to top of page