Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Prehnite from
Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA


02602370017272298416384.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
05069590017272020397651.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
00506660017362048588366.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
07148210017272020401023.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
05674020017362048705696.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
04953400017362048829322.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
00506660017362048588366.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
04890110017362049029477.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
02602370017272298416384.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
05069590017272020397651.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
01716040017362049217389.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
07148210017272020401023.jpg
Prehnite, etc.

Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
Locality type:Mine
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Native Copper38
Epidote10
Native Silver4
Calcite2
Malachite1
Datolite1
K Feldspar1
- var Adularia1
Pumpellyite Subgroup1
Basalt1
Quartz1
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Iroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
Photo GalleryView Gallery (8 photos)
Data Identifiers
Mindat Occurrence Record ID:69707
Long-form Identifier:1:3:69707:3
GUID (UUID V4):0
Nearest other occurrences of Prehnite
1.3km (0.8 miles) ⓘSeneca No. 2 shaft (Gratiot Mine), Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
1.4km (0.9 miles) ⓘSeneca No. 1 Shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
1.7km (1.1 miles) ⓘMohawk Mine, Mohawk, Allouez Township, Keweenaw County, Michigan, USA
1.8km (1.1 miles) ⓘOld Seneca Mine (Seneca No. 4 Shaft), Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA
3.6km (2.2 miles) ⓘAhmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA
3.6km (2.3 miles) ⓘOjibway Mine, Ojibway, Allouez Township, Keweenaw County, Michigan, USA
3.7km (2.3 miles) ⓘMass Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA
3.7km (2.3 miles) ⓘManhattan Exploration Prospect, Ojibway, Allouez Township, Keweenaw County, Michigan, USA
4.5km (2.8 miles) ⓘArsenide Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA
4.7km (2.9 miles) ⓘAllouez No. 3 Mine, Allouez Mine, Allouez, Allouez Township, Keweenaw County, Michigan, USA
References
Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111
 
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: October 21, 2026 05:47:45
Go to top of page