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

Stilpnomelane from
Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA


Locality type:Road Cutting
Classification
Species:Stilpnomelane
Formula:K4Fe482+[Si64Al8]O164(OH)52 · nH2O
Formation:Secondary
Comments:Included in a list of species with a question mark and no supporting data.
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Stilpnomelane data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657246
Long-form Identifier:1:3:657246:4
GUID (UUID V4):0
Nearest other occurrences of Stilpnomelane
23.8km (14.8 miles) ⓘO & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
27.2km (16.9 miles) ⓘTalcott Mountain (King Phillip's Cave), Simsbury, Hartford County, Connecticut, USA
34.2km (21.3 miles) ⓘState Route 189 road cut, Tariffville Gorge, Bloomfield, Hartford County, Connecticut, USA
37.8km (23.5 miles) ⓘReed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex County, Connecticut, USA
38.1km (23.7 miles) ⓘRoncari Quarry, East Granby, Hartford County, Connecticut, USA
38.8km (24.1 miles) ⓘState Route 20 road cut, East Granby, Hartford County, Connecticut, USA
45.8km (28.4 miles) ⓘNorth Branford Quarry, North Branford, New Haven County, Connecticut, USA
56.4km (35.0 miles) ⓘLane & Son traprock quarries (Lane's Quarry), Westfield, Hampden County, Massachusetts, USA
80.8km (50.2 miles) ⓘNotch Quarry (Lane Quarry; Amherst Quarry; Round Mountain Quarry), Amherst, Hampshire County, Massachusetts, USA
References
Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
 
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 16:28:49
Go to top of page