| 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: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view Portugal 1 & 2 quarries, Malpartida, Malpartida e Vale de Coelha, Almeida, Guarda, Portugal |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 416339 |
| Long-form Identifier: | 1:3:416339:8 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 37.1km (23.0 miles) | ⓘBarruecopardo Mine, Barruecopardo, Salamanca, Castile and Leon, Spain |
| 39.7km (24.7 miles) | ⓘNumão prospect, Numão, Vila Nova de Foz Côa, Guarda, Portugal |
| 48.4km (30.1 miles) | ⓘGold deposits (incl. Saturno Mine; Los Espinos Valley), Barruecopardo, Salamanca, Castile and Leon, Spain |
| 57.7km (35.9 miles) | ⓘRatoeira No. 1 quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal |
| 58.2km (36.2 miles) | ⓘRatoeira quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal |
| 59.0km (36.6 miles) | ⓘVigia Mine, U.F. Aguiar da Beira e Coruche, Aguiar da Beira, Guarda, Portugal |
| 61.2km (38.0 miles) | ⓘFonte Limeira quarry, U.F Romãs Decermilo e Vila Longa, Sátão, Viseu, Portugal |
| 62.1km (38.6 miles) | ⓘVila Seca Mine, Vila Seca, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal |
| 62.3km (38.7 miles) | ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal |
| 63.3km (39.3 miles) | ⓘSão Pedro das Águias Mine, U.F Távora e Pereiro, Tabuaço, Viseu, Portugal |
| References |
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