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

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


Locality type:Road Cutting
Classification
Species:Greenockite
Formula:CdS
Formation:Primary
Comments:Though reportedly occurring with sphalerite at several Connecticut localities, these reports appear to be based solely on the yellow color. While plausible, they lack analytical confirmation; both chemical and structural to differentiate it from similar appearing, dimorphous hawleyite. Schooner (1961) claims greenockite rarely forms intergrowths with sphalerite here.
Colour:yellow
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Greenockite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96362
Long-form Identifier:1:3:96362:0
GUID (UUID V4):0
Nearest other occurrences of Greenockite
26.8km (16.7 miles) ⓘRoxbury Iron Mine, Mine Hill, Roxbury, Litchfield County, Connecticut, USA
38.0km (23.6 miles) ⓘOld lead mine, Brookfield, Fairfield County, Connecticut, USA
38.6km (24.0 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
40.9km (25.4 miles) ⓘMiddletown lead mines (Middletown Mine), Middletown, Middlesex County, Connecticut, USA
41.3km (25.6 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
42.5km (26.4 miles) ⓘCanaan, North Canaan, Litchfield County, Connecticut, USA
50.1km (31.1 miles) ⓘState Route 25 road cuts, Trumbull, Fairfield County, Connecticut, USA
56.9km (35.4 miles) ⓘFillow Quarry, Branchville, Redding, Fairfield County, Connecticut, USA
References
Schooner, Richard. (1961), The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
 
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 09:35:27
Go to top of page