| 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: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Quartz | 1 |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view Mata da Galinheira Mine, Vila Chã (São João Baptista e Santiago), Ponte da Barca, Viana do Castelo, Portugal |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 1409578 |
| Long-form Identifier: | 1:3:1409578:6 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 0.6km (0.4 miles) | ⓘMonte do Castelo da Pena Mine, Vila Chã (São João Baptista e Santiago), Ponte da Barca, Viana do Castelo, Portugal |
| 21.5km (13.3 miles) | ⓘBorrageiro Mine, Cabril, Montalegre, Vila Real, Portugal |
| 23.4km (14.6 miles) | ⓘCabanas Mine, Arcozelo, Ponte de Lima, Viana do Castelo, Portugal |
| 31.5km (19.5 miles) | ⓘBorralha Mines, Salto, Montalegre, Vila Real, Portugal |
| 33.5km (20.8 miles) | ⓘValdarcas Mine, Covas, Vila Nova de Cerveira, Viana do Castelo, Portugal |
| 33.8km (21.0 miles) | ⓘAplito-pegmatitic area, Covas, Vila Nova de Cerveira, Viana do Castelo, Portugal |
| 44.9km (27.9 miles) | ⓘA Franqueira, A Cañiza, Pontevedra, Galicia, Spain |
| 48.0km (29.8 miles) | ⓘPorriño quarries, Porriño, Pontevedra, Galicia, Spain |
| 50.1km (31.1 miles) | ⓘCillarga Quarry, Ponteareas, Pontevedra, Galicia, Spain |
| 53.5km (33.3 miles) | ⓘMonte de Entre-Portelas Mine (S. João Mine; Adoria Mine), Cerva e Limões, Ribeira de Pena, Vila Real, Portugal |
| References |
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Mata da Galinheira Mine, Vila Chã, Ponte da Barca, Viana do Castelo, Portugal