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

Actinolite from
Lenni, Middletown Township, Delaware County, Pennsylvania, USA


Classification
Species:Actinolite
Formula:◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Actinolite data
Locality Data:Click here to view Lenni, Middletown Township, Delaware County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:605751
Long-form Identifier:1:3:605751:0
GUID (UUID V4):0
Nearest other occurrences of Actinolite
2.5km (1.5 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
7.0km (4.3 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
14.0km (8.7 miles) ⓘOsborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
23.5km (14.6 miles) ⓘGladwyne Quarries, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
23.8km (14.8 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
25.0km (15.6 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
26.8km (16.6 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
32.7km (20.3 miles) ⓘKeystone Trap Rock Quarry, Cornog, Wallace Township, Chester County, Pennsylvania, USA
38.9km (24.1 miles) ⓘIron Hill Mine (Chestnut Hill Mine), Newark, New Castle County, Delaware, USA
39.5km (24.5 miles) ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
References
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp. p.193
 
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 13:43:30
Go to top of page