| Locality type: | Mine |
| Classification |
|---|
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| Species: | 'Biotite' (not an IMA approved species) |
| Formula: | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Confirmation |
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|
| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view São Miguel de Acha Mines, São Miguel de Acha, Idanha-a-Nova, Castelo Branco, Portugal |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 855287 |
| Long-form Identifier: | 1:3:855287:7 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 17.8km (11.1 miles) | ⓘGranite outcrop, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal |
| 36.0km (22.4 miles) | ⓘSegura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal |
| 37.0km (23.0 miles) | ⓘCerro Queimado, União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal |
| 73.1km (45.4 miles) | ⓘVila Seca Mine, Vila Seca, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal |
| 73.2km (45.5 miles) | ⓘRochel, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 73.3km (45.5 miles) | ⓘChão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 73.9km (45.9 miles) | ⓘCubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 77.1km (47.9 miles) | ⓘPicoto Mine, Vilar Seco, Nelas, Viseu, Portugal |
| 77.6km (48.2 miles) | ⓘRegada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 82.6km (51.3 miles) | ⓘVenturinha, Sezures, Penalva do Castelo, Viseu, Portugal |
| References |
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