| Locality type: | Shaft |
| Classification |
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| Species: | Prehnite |
| Formula: | Ca2Al2Si3O10(OH)2 |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Algodonite | 4 |
| Native Copper | 3 |
| Natrolite | 1 |
| Calcite | 1 |
| Data |
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| Mineral Data: | Click here to view Prehnite data |
| Locality Data: | Click here to view Seneca No. 2 shaft (Gratiot Mine), Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 384745 |
| Long-form Identifier: | 1:3:384745:9 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Prehnite |
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| 1.1km (0.7 miles) | ⓘMohawk Mine, Mohawk, Allouez Township, Keweenaw County, Michigan, USA |
| 1.2km (0.8 miles) | ⓘOld Seneca Mine (Seneca No. 4 Shaft), Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 1.3km (0.8 miles) | ⓘIroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 1.3km (0.8 miles) | ⓘSeneca No. 1 Shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 3.4km (2.1 miles) | ⓘMass Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 3.5km (2.2 miles) | ⓘOjibway Mine, Ojibway, Allouez Township, Keweenaw County, Michigan, USA |
| 3.6km (2.2 miles) | ⓘAhmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 4.2km (2.6 miles) | ⓘManhattan Exploration Prospect, Ojibway, Allouez Township, Keweenaw County, Michigan, USA |
| 4.3km (2.7 miles) | ⓘArsenide Fissure, Ahmeek Mine, Ahmeek, Allouez Township, Keweenaw County, Michigan, USA |
| 4.9km (3.1 miles) | ⓘAllouez No. 3 Mine, Allouez Mine, Allouez, Allouez Township, Keweenaw County, Michigan, USA |
| References |
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Seneca No. 2 shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA