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Biotite from
Bestrée, Pointe du Raz, Plogoff, Cape Sizun, Finistère, Brittany, France

Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
References
References:Barrière, M., Chauris, L., Fouquet, Y., Guilcher, A., Lefort, J.-P., Pelhate, A. (1985): Notice explicative de la feuille Pointe du Raz à 1/50000, B.R.G.M., Editions du Service géologique national, p. 9.
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Bestrée, Pointe du Raz, Plogoff, Cape Sizun, Finistère, Brittany, France
Nearest other occurrences of Biotite
1.6km (1.0 miles) A Pointe du Raz, Plogoff, Cape Sizun, Finistère, Brittany, France
1.8km (1.1 miles) B Feunteun Aod Point, Plogoff, Cape Sizun, Finistère, Brittany, France
3.0km (1.8 miles) C Pointe du Van, Cléden-Cap-Sizun, Cape Sizun, Finistère, Brittany, France
9.7km (6.0 miles) D Nerroth island, Sein Island, Finistère, Brittany, France
11.6km (7.2 miles) E Plas ar Skoul, Sein Island, Finistère, Brittany, France
35.2km (21.9 miles) F Trégana beach alluvials, Trégana, Locmaria-Plouzané, Finistère, Brittany, France
37.2km (23.1 miles) G Blancs Sablons beach alluvials, Le Conquet, Finistère, Brittany, France
42.9km (26.7 miles) H Ruscumunoc beach alluvials, Ruscumunoc, Plouarzel, Finistère, Brittany, France
48.4km (30.1 miles) I Rocher du Crapaud beach alluvials, Lanildut, Finistère, Brittany, France
52.6km (32.7 miles) J Penn ar Roc'h - Porz an Ejen area, Ouessant island, Finistère, Brittany, France
55.6km (34.6 miles) K Guélet ar C'hoat, Plouguin, Finistère, Brittany, France
65.3km (40.6 miles) L Wrac'h island, Lilia, Plouguerneau, Finistère, Brittany, France
68.4km (42.5 miles) M Toullouarn quarry, Guisseny, Finistère, Brittany, France
73.4km (45.6 miles) N Saint-Egarec beach alluvials, Kerlouan, Finistère, Brittany, France
76.5km (47.5 miles) O Brignogan-Plages, Plounéour-Brignogan-Plages, Finistère, Brittany, France
76.5km (47.5 miles) P Brignogan-Plages, Finistère, Brittany, France
82.3km (51.1 miles) Q Keranvel, Guiscriff, Morbihan, Brittany, France
85.7km (53.2 miles) R Kerbizien, Poullaouen, Finistère, Brittany, France
93.3km (58.0 miles) S Poul Morvan beach alluvials, Callot island, Carantec, Finistère, Brittany, France
94.0km (58.4 miles) T Penn ar Waremm beach alluvials, Callot island, Carantec, Finistère, Brittany, France
95.1km (59.1 miles) U Ile Verte, Carantec, Finistère, Brittany, France
105.0km (65.2 miles) V Spernec Point, Primiture, Groix Island, Morbihan, Brittany, France
125.3km (77.9 miles) W Rebillon quarries, La Clarté, Perros-Guirec, Côtes-d'Armor, Brittany, France
125.5km (78.0 miles) X Coz Porz beach, Trégastel, Côtes-d'Armor, Brittany, France
125.6km (78.1 miles) Y B.G.P. Granite quarry, La Clarté, Perros-Guirec, Côtes-d'Armor, Brittany, France
126.6km (78.6 miles) Z Madec Quarry, La Clarté, Perros-Guirec, Côtes-d'Armor, Brittany, France
157.1km (97.6 miles) 0 Trévenaste beach alluvials, Sarzeau, Morbihan, Brittany, France
Mineral and/or Locality  
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