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

Iona Island, Bear Mountain State Park, Rockland County, New York, USAi
Regional Level Types
Iona IslandIsland
Bear Mountain State ParkState Park
Rockland CountyCounty
New YorkState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
09405620017272278862353.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
01719790017272278881035.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
02647370017272018137180.jpg
Hedenbergite

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
00680450017272052759867.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
01719790017272278881035.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
03060930017272018093063.jpg
Hedenbergite

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
00680450017272052759867.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
01719790017272278881035.jpg
Iona Island

Iona Island, Bear Mountain State Park, Rockland County, New York, USA
Latitude & Longitude (WGS84):
41° 18' 23'' North , 73° 58' 54'' West
Latitude & Longitude (decimal):
41.30650,-73.98176
GeoHash:
G#: dr76ux85u
GRN:
N28W40
Type:
Island
Köppen climate type:
Cfa : Humid subtropical climate
Mindat Locality ID:
175656
Long-form identifier:
mindat:1:2:175656:5
GUID (UUID V4):
0


Ex-Navy property. Currently a bald eagle sanctuary managed by Bear Mountain State Park. Open to public access only at gravel parking areas along access road and near railroad tracks. Area is heavily patrolled not only by State Park Police, but also by CSX Railroad police. Be sure not to trespass on the railroad right-of-way. Best mineralogy is in the area west of the railroad rock cuts at the north end of the island. Best to hike through the woods west of the rock cuts as walking along the train tracks is not allowed. Do not enter ANY fenced area. Carrying collecting tools outside of a backpack is NOT a good idea.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


5 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 9 - Silicates
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘAugite ?9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘHedenbergite9.DA.15CaFe2+Si2O6
ⓘMeionite9.FB.15Ca4Al6Si6O24CO3
Unclassified
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

CCarbon
Cⓘ CalciteCaCO3
Cⓘ MeioniteCa4Al6Si6O24CO3
OOxygen
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ CalciteCaCO3
Oⓘ HedenbergiteCaFe2+Si2O6
Oⓘ MeioniteCa4Al6Si6O24CO3
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Garnet GroupX3Z2(SiO4)3
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Alⓘ MeioniteCa4Al6Si6O24CO3
SiSilicon
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ HedenbergiteCaFe2+Si2O6
Siⓘ MeioniteCa4Al6Si6O24CO3
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Garnet GroupX3Z2(SiO4)3
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ CalciteCaCO3
Caⓘ HedenbergiteCaFe2+Si2O6
Caⓘ MeioniteCa4Al6Si6O24CO3
Caⓘ TitaniteCaTi(SiO4)O
TiTitanium
Tiⓘ TitaniteCaTi(SiO4)O
FeIron
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ HedenbergiteCaFe2+Si2O6

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Observations from recent trips to site.
Quick NavTopMineral ListOther RegionsReferences
 
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 16:25:58 Page updated: August 12, 2025 10:28:53
Go to top of page