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

Hemimorphite from
Old lead mine, Brookfield, Fairfield County, Connecticut, USA


Locality type:Mine
Classification
Species:Hemimorphite
Formula:Zn4Si2O7(OH)2 · H2O
Comments:Confusion by later writers with smithsonite due to Shepard (1837) using the term "calamine", which could mean either mineral in general, but Shepard describes "calamine" as a zinc carbonate and uses the term "electric calamine" for material found elsewhere that he describes as a hydrous zinc silicate, clearly hemimorphite.
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Hemimorphite data
Locality Data:Click here to view Old lead mine, Brookfield, Fairfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:820646
Long-form Identifier:1:3:820646:6
GUID (UUID V4):0
Nearest other occurrences of Hemimorphite
2.0km (1.2 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
38.0km (23.6 miles) ⓘThomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
42.3km (26.3 miles) ⓘSouth Main Street construction site, Torrington, Litchfield County, Connecticut, USA
54.1km (33.6 miles) ⓘState Route 22 roadcut, Millerton, Town of North East (Northeast), Dutchess County, New York, USA
66.9km (41.6 miles) ⓘMiddletown lead mines (Middletown Mine), Middletown, Middlesex County, Connecticut, USA
76.2km (47.3 miles) ⓘRoncari Quarry, East Granby, Hartford County, Connecticut, USA
88.7km (55.1 miles) ⓘBraen Quarry, Haledon, Passaic County, New Jersey, USA
89.1km (55.4 miles) ⓘBulls Ferry Road, North Bergen, North Bergen Township, Hudson County, New Jersey, USA
99.7km (62.0 miles) ⓘMcAfee Quarry, McAfee, Vernon Township, Sussex County, New Jersey, USA
References
Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey Bulletin 51.
 
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 09:54:17
Go to top of page