| Locality type: | Mine |
| Classification |
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| Species: | Tephroite |
| Formula: | Mn22+(SiO4) |
| Confirmation |
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| Validity: | Unconfirmed/Questioned |
| Data |
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| Mineral Data: | Click here to view Tephroite data |
| Locality Data: | Click here to view Forge Hill iron mines (Old Hawley iron mines), West Hawley, Hawley, Franklin County, Massachusetts, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 29997 |
| Long-form Identifier: | 1:3:29997:8 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Tephroite |
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| 11.5km (7.1 miles) | ⓘBetts Manganese Mines, Plainfield, Hampshire County, Massachusetts, USA |
| References |
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