| Locality type: | Quarry |
| 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 Ratoeira quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 747112 |
| Long-form Identifier: | 1:3:747112:4 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 0.7km (0.5 miles) | ⓘRatoeira No. 1 quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal |
| 3.4km (2.1 miles) | ⓘVigia Mine, U.F. Aguiar da Beira e Coruche, Aguiar da Beira, Guarda, Portugal |
| 5.6km (3.5 miles) | ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal |
| 10.1km (6.3 miles) | ⓘFonte Limeira quarry, U.F Romãs Decermilo e Vila Longa, Sátão, Viseu, Portugal |
| 16.6km (10.3 miles) | ⓘVenturinha, Sezures, Penalva do Castelo, Viseu, Portugal |
| 24.3km (15.1 miles) | ⓘVila Seca Mine, Vila Seca, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal |
| 26.4km (16.4 miles) | ⓘSão Pedro das Águias Mine, U.F Távora e Pereiro, Tabuaço, Viseu, Portugal |
| 30.3km (18.8 miles) | ⓘRegada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 32.9km (20.4 miles) | ⓘRochel, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| 33.0km (20.5 miles) | ⓘChão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal |
| References |
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