| Locality type: | Shaft |
| Classification |
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| Species: | Prehnite |
| Formula: | Ca2Al2Si3O10(OH)2 |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Prehnite data |
| Locality Data: | Click here to view Avery shaft, Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 402011 |
| Long-form Identifier: | 1:3:402011:0 |
| GUID (UUID V4): | 4c8c93c1-d1e5-48da-b6b4-a3fbcb6312d3 |
| Nearest other occurrences of Prehnite |
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| 0.1km (0.1 miles) | ⓘCliff Mine, Allouez Township, Keweenaw County, Michigan, USA |
| 0.4km (0.3 miles) | ⓘSouth Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA |
| 0.9km (0.5 miles) | ⓘNorth American Mine, Allouez Township, Keweenaw County, Michigan, USA |
| 1.7km (1.1 miles) | ⓘNorth Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA |
| 2.4km (1.5 miles) | ⓘRobbins Mine (West Vein Mine), Phoenix, Houghton Township, Keweenaw County, Michigan, USA |
| 2.8km (1.7 miles) | ⓘManhattan Exploration Prospect, Ojibway, Allouez Township, Keweenaw County, Michigan, USA |
| 3.2km (2.0 miles) | ⓘPhoenix Mine, Phoenix, Houghton Township, Keweenaw County, Michigan, USA |
| 3.4km (2.1 miles) | ⓘEagle River (Babbitt) Mine, Phoenix, Houghton Township, Keweenaw County, Michigan, USA |
| 3.7km (2.3 miles) | ⓘEagle River, Eagle River, Houghton Township, Keweenaw County, Michigan, USA |
| 3.8km (2.3 miles) | ⓘLake Superior Mine (Old Phoenix Fissure), Phoenix, Houghton Township, Keweenaw County, Michigan, USA |
| References |
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| Reference Search (possible matching items) |
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 | | Journal (article/letter/editorial) | | 57647 Caledonia Street Calumet, Michigan 49913 datolite@charter.net Keweenaw Figure 1. A delicate group...of copper crystals collected at the Ojibway No. 1 mine in summer 2009 by Steve Whelan. The specimen is...Copper Country Figure 2. Generalized map of the Michigan copper district showing the location of the new...Mineral Finds in Michigan’s Copper Country T he Michigan Copper Country, also known as the Lake Superior...scenic Keweenaw Peninsula, which juts out into Lake Superior at the western end of Upper Michigan. The |  | | Journal (article/letter/editorial) | | 81427 THE CLIFF MINE, discovered in 1844, is located on the Keweenaw Peninsula of Upper Michigan in the...turned the Cliff into a successful mining operation and made it the first mine on the "Keweenaw" to pay...dividends to stockholders. Throughout its history, the mine also produced spectacular specimens of crystallized...over. N ative copper was first mined on the Keweenaw Peninsula several thousand years ago by Native...controlled three mineral tracts on the northern part of Keweenaw Peninsula. After examining the copper prospect |  | | 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 |  | | Journal (article/letter/editorial) | | recovered from a large vug in the fissure vein of the Cliff mine; the largest crystal is 2 cm across. The specimen...Probably the best arborescent silver from the Cliff mine, this specimen is 9.5 × 10.5 cm and was originally...Jaszczak photo. Figure 18. This calcite from the Cliff mine is 3.6 cm long and perched on a matrix of spongy...lava on earth (Bornhorst and Rose 1994). At the Cliff mine it thickens to more than 1,300 feet and remains...some of the veins (Butler and Burbank 1929). Cliff Mine After the failed 1844 mining venture at the Hays |  | | Journal (issue) | | MICHIGAN COPPER! The Mineralogical Record JANUARY-FEBRUARY 2023 ? VOLUME 54 ? NUMBER 1 ? $40 ... KRISTALLE Est.1971 Laguna Beach, California, USA • Tel: +1 949 494 5155 • Email: info@kristalle.com.......................3 by W. E. Wilson The Keweenaw County Fissure Mines.......................................13 by C. J. Stefano The Cliff Mine, Keweenaw County, Michigan................................... Stefano & P. Persson The Central Mine, Keweenaw County, Michigan................................... |  | | Journal (issue) | | the Copper rontier Development of Michigan's Cliff Mine ( 1845-1870) by Paul Chrastina Introduction...into Kansas, as well as southeast through central Michigan, perhaps as far as western Tennessee. Today, the...the Copper Frontier: Development of Michigan's Cliff Mine (1845-1870) .............................................................36 northern Michigan. The Keweenaw Peninsula is a narrow promontory, 70 miles...tained North America's first great mining boom, the Keweenaw cop per rush of the 1840's. Early Copper Mining |
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