| Locality type: | Mine |
| Classification |
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| Species: | 'Pumpellyite Subgroup' (not an IMA approved species) |
| Formula: | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Pumpellyite Subgroup data |
| Locality Data: | Click here to view Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 101949 |
| Long-form Identifier: | 1:3:101949:0 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Pumpellyite Subgroup |
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| 0.5km (0.3 miles) | ⓘCentral No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA |
| 0.5km (0.3 miles) | ⓘCentral Mine, Central, Houghton Township, Keweenaw County, Michigan, USA |
| 6.0km (3.7 miles) | ⓘSt. Clair Mine, Phoenix, Houghton Township, Keweenaw County, Michigan, USA |
| 7.2km (4.5 miles) | ⓘDelaware Mine (Delaware Conglomerate Mine), Delaware, Grant Township, Keweenaw County, Michigan, USA |
| 7.9km (4.9 miles) | ⓘEagle River, Houghton Township, Keweenaw County, Michigan, USA |
| 10.0km (6.2 miles) | ⓘAvery shaft, Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA |
| 13.6km (8.4 miles) | ⓘMount Bohemia Mine, Mount Bohemia, Lac La Belle, Grant Township, Keweenaw County, Michigan, USA |
| 13.9km (8.7 miles) | ⓘMedora Mine, Mandan, Grant Township, Keweenaw County, Michigan, USA |
| 15.7km (9.8 miles) | ⓘIroquois Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| 16.8km (10.5 miles) | ⓘSeneca No. 1 Shaft, Seneca Mine, Seneca, Allouez Township, Keweenaw County, Michigan, USA |
| References |
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Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA