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

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


Locality type:Road Cutting
Classification
Species:Pyromorphite
Formula:Pb5(PO4)3Cl
Formation:Secondary
Comments:Fine green crystals, some of which comprise radiating groups. Schooner (1961) describes "beautiful specimens...These are equally small, compared with pyromorphite from classical localities, but they are clean and quite attractive. Some show the mineral, associated with wulfenite crystals, in vugs of pegmatite, near ore veins; others have pyromorphite filling seams in green and purple fluorite."
Habit:radiating groups of elongated prismatic
Colour:green
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyromorphite data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96379
Long-form Identifier:1:3:96379:0
GUID (UUID V4):0
Nearest other occurrences of Pyromorphite
18.6km (11.6 miles) ⓘHuckleberry Hill, Avon, Hartford County, Connecticut, USA
20.1km (12.5 miles) ⓘCanton Lead Mines (Cherry Brook lead mine; Dyer Farm zinc mine), Rattlesnake Hill, Canton, Hartford 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
44.8km (27.9 miles) ⓘBiermann Quarries (Bethel quarries; Codfish Hill Quarry), Bethel, Fairfield 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
70.6km (43.9 miles) ⓘLoudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire County, Massachusetts, USA
89.0km (55.3 miles) ⓘOssining (Sing Sing), Westchester County, New York, USA
References
Schooner, Richard. (1961), The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Segeler, Curt G., Molon, Joseph (1985) The Thomaston Dam Site Thomaston, Connecticut. Rocks & Minerals, 60 (3) 119-124 doi:10.1080/00357529.1985.11764386
 
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 12:58:59
Go to top of page