| 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 Gwernavalou Quarry, Trémargat, Guingamp, Côtes-d'Armor, Brittany, France |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 198787 |
| Long-form Identifier: | 1:3:198787:4 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 27.1km (16.8 miles) | ⓘKerbizien, Poullaouen, Châteaulin, Finistère, Brittany, France |
| 33.7km (21.0 miles) | ⓘLe Gouffre, Huelgoat, Châteaulin, Finistère, Brittany, France |
| 40.8km (25.3 miles) | ⓘKeranvel, Guiscriff, Pontivy, Morbihan, Brittany, France |
| 56.0km (34.8 miles) | ⓘRebillon quarries, La Clarté, Perros-Guirec, Lannion, Côtes-d'Armor, Brittany, France |
| 56.5km (35.1 miles) | ⓘB.G.P. Granite quarry, La Clarté, Perros-Guirec, Lannion, Côtes-d'Armor, Brittany, France |
| 57.1km (35.5 miles) | ⓘMadec Quarry, La Clarté, Perros-Guirec, Lannion, Côtes-d'Armor, Brittany, France |
| 59.5km (37.0 miles) | ⓘCoz Porz beach, Trégastel, Lannion, Côtes-d'Armor, Brittany, France |
| 62.4km (38.8 miles) | ⓘPoul Morvan beach alluvials, Callot island, Carantec, Morlaix, Finistère, Brittany, France |
| 62.7km (39.0 miles) | ⓘIle Verte, Carantec, Morlaix, Finistère, Brittany, France |
| 63.1km (39.2 miles) | ⓘPenn ar Waremm beach alluvials, Callot island, Carantec, Morlaix, Finistère, Brittany, France |
| References |
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