| Locality type: | River |
| Classification |
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| Species: | Prehnite |
| Formula: | Ca2Al2Si3O10(OH)2 |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Data |
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| Mineral Data: | Click here to view Prehnite data |
| Locality Data: | Click here to view Gratiot River, Allouez Township, Keweenaw County, Michigan, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 1241724 |
| Long-form Identifier: | 1:3:1241724:9 |
| GUID (UUID V4): | 1a2f1cb1-33d8-4cfa-8702-0ab44ddaf836 |
| Nearest other occurrences of Prehnite |
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| 2.4km (1.5 miles) | ⓘBlack Creek, Allouez Township, Keweenaw County, Michigan, USA |
| 3.9km (2.4 miles) | ⓘSeven Mile Point, Allouez Township, Keweenaw County, Michigan, USA |
| 6.5km (4.1 miles) | ⓘAllouez No. 3 Mine, Allouez Mine, Allouez, Allouez Township, Keweenaw County, Michigan, USA |
| 7.4km (4.6 miles) | ⓘAhmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 7.5km (4.7 miles) | ⓘIroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 7.7km (4.8 miles) | ⓘSeneca No. 1 Shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 7.8km (4.8 miles) | ⓘArsenide Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 7.9km (4.9 miles) | ⓘTamarack Waterworks Beach, Calumet Township, Houghton County, Michigan, USA |
| 8.0km (5.0 miles) | ⓘMass Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 8.2km (5.1 miles) | ⓘFive Mile Point, Allouez Township, Keweenaw County, Michigan, USA |
| References |
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| Reference Search (possible matching items) |
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 | | Report (issue) | | University University Michigan Townsend Drive Drive 1400Townsend 1400 Houghton, Houghton, Michigan Michigan49931-1...J. the Keweenaw Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, Keweenaw Peninsula...Peninsula, Michigan: Institute on Lake Superior Geology Proceedings, 40th 40thAnnual AnnualMeeting, Meeting..."Field Guide to the Geology Geology of the the Keweenaw Keweenaw Annual Institute Institute on on Lake Lake...Lake Superior Superior Geology Peninsula, Michigan" Michigan" (Bornhorst (Bornhorst and others, 1983) for |  | | Book | | Mineralogy of Michigan by E. W. Heinrich updated and revised • by George W. Robinson M By E W~ Hellnr]ch...Museum Michigan Technological University Houghton, Michigan 49931 2004 © MINERALOGY OF MICHIGAN 3 FOREWORD...FOREWORD Michigan has a long and varied geologic history that includes repeated episodes of volcanism...before the first Europeans set foot here. When Michigan became a state in 1837, one of the first actions...and we continue to learn more about them today. Michigan minerals helped to build the state and nation |  | | Report (issue) | | (CaBSiO4OH) vesicle filling from a basaltic Houghton County lava flow. Small specks of native copper occur...the surface and between the nodular masses. The Michigan Bicentennial symbol (back cover) incorporates...Survey Division BULLETIN 6 THE MINERALOGY OF MICHIGAN by E. Wm. Heinrich Professor of Mineralogy and...University of Michigan Ann Arhor, Michigan Lansing, Michigan 1976 STATE OF MICHIGAN WILLIAM G. Mrr...State of Michigan CL '48 s.321.6. Printed by Speaker-Hines and Thomas, Inc., Lansing, Michigan. Available |  | | Report (issue) | | Extent and General Nature of the Keweenaw Series Lithology of the Keweenaw Series Section I. Basic Original...III. Summary View of the Original Rocks of the Keweenaw Series Section IV. Detrital Rocks Chapter IV....Features of the Three Classes of Rocks of the Keweenaw Chapter Chapter II. 24 III. 34 '. 35 91... General Stratigraphy of the Keweenaw Series Chapter VI.— The Keweenaw an Rocks op the South Shore of...Section I.— Keweenaw Point Section II.— The Region between Portage Lake and the Ontonagon River Section III |  | | Book | | Lakes States Wisconsin, Indiana, Illinois, Michigan, by June Culp Zeitner $5.95 Gem Guides Book... and Michigan. Dow Chemical has reported finding diamonds in the kimberlites of upper Michigan, and vast...shoreline on both Lake Superior and Lake Michigan. Michigan is the state with the most shoreline on these...fresh water seas, with waters of Lake Superior, Michigan and Huron virtually surrounding it. Illinois and...and Indiana are bordered in part by Lake Michigan, and Ohio hugs the edge of Lake Erie. These states |  | | Book (edition) | | describes sites under of the nearest town and county. and the many maps included book contain such...hydrofluoric acid which it gray and pitted. To from prehnite, heat the mineral in a closed glass tube. Smithsonite...such formations come the sapphires in the Missouri River near Helena, Montana, and the star rocks, garnets...Survey. Persons living east of the Mississippi River may obtain these maps from the USGS Map Center...Consider the weather when planning a such as the Green River country in Utah or California and Arizona, Neither |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...and pitted. To differentiate smithsonite from prehnite, heat the mineral in a closed glass tube. Smithsonite...Basalt is the copper- and agate-bearing rock in the Michigan Upper Peninsula; underneath the whole region is...banded agate and such minerals as thomsonite and prehnite, and in the form of geodes containing crystal...such formations come the sapphires in the Missouri River near Helena, Montana, and the star garnets of Idaho |  | | Book | | HfiRIN COUNTY FREE LIBRfiRY 311110G386652Q I V Russell P MacFal A COLOR TREASUF FOR COLLECTORS...to Hunting Locations ? i 9 GIVEN TO THE MARIN COUNTY LIBRARY BY MARI N L MTNF.RAT. SOCTETY DAVID...for the United Geological Survey IVIississippi river can be ordered from the U.S. Geological Surveys...from which the condition. precise in slppi river maps needed can be chosen are provided drawing...they may be able to buy specimens. map of Keweenaw County. Mich- Part of the U.S. Geological Survey |  | | Book | | History of Lake Superior mining The Keweenaw copper district of Michigan 33 35 35 Copper mining on Isle...iron district Crystal Falls, Florence, and Iron River Gogebic iron district Vermilion iron district Mesabi...developments 45 ., 45 Clinton iron ores of Dodge County, Wis 45 Paleozoic iron ores in western Wisconsin...geologic 70 knowledge 72 Bibliography 73 Michigan Northern Wisconsin Minnesota 77 Ontario 81...Menominee 96 96 97 district Crystal Falls district Keweenaw Point Northern ^Wisconsin Central Wisconsin |
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