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Opal from
Gergovie, La-Roche-Blanche, Veyre-Monton, Puy-de-Dôme, Auvergne-Rhône-Alpes, France

Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
References
References:Belot, Victor R. (1978) Guide des minéraux, coquillages et fossiles: où les trouver en France, comment les reconnaître et les collectionner (Guides Horay). Pierre Horay (Ed.), 224 pp.;
Périchaud, J.-J. (1985) Les Minéraux d'Auvergne, Vol. 1.
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Gergovie, La-Roche-Blanche, Veyre-Monton, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Nearest other occurrences of Opal
5.7km (3.5 miles) A Côte des Pompes, Saulzet-le-Chaud, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
18.0km (11.2 miles) B Mineral spring, Saint-Nectaire, Champeix, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
19.8km (12.3 miles) C Puy de Tunisset, Saint-Ours-les-Roches, Pontgibaud, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
34.1km (21.2 miles) D La Barre Mine (La Martinèche Mine), Saint-Jacques-d'Ambur, Pontgibaud, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
34.7km (21.6 miles) E Cunlhat, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
45.0km (28.0 miles) F Bancherelle Mine, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
45.1km (28.0 miles) G Reliez, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
45.1km (28.0 miles) H Etang de Reliez, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
45.8km (28.5 miles) I Roffin Mine, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
45.9km (28.5 miles) J Gagnol Mine, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
48.1km (29.9 miles) K Gourniaud Mine, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
48.6km (30.2 miles) L Bigay Mine, Lachaux, Puy-Guillaume, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
48.9km (30.4 miles) M La Violette farm, Saint-Beauzire, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
63.2km (39.3 miles) N Puy de Menoyre, Menet, Cantal, Auvergne-Rhône-Alpes, France
66.9km (41.6 miles) O Mont Semiol (Mont Semiouse; Mont Simiouse), Châtelneuf, Loire, Auvergne-Rhône-Alpes, France
75.3km (46.8 miles) P Moulergues, Chastel, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
76.0km (47.2 miles) Q Chamblet, Montluçon, Allier, Auvergne-Rhône-Alpes, France
76.5km (47.6 miles) R La Grange Mine, Meymac, Corrèze, Nouvelle-Aquitaine, France
82.9km (51.5 miles) S Montalimbert mine, Saint-Hilaire, Moulins, Allier, Auvergne-Rhône-Alpes, France
95.1km (59.1 miles) T Le Croustet (Mont Croustet), Ceyssac, Le Puy-en-Velay, Haute-Loire, Auvergne-Rhône-Alpes, France
100.7km (62.6 miles) U Le Crêt, Saint-Priest-en-Jarez, Saint-Etienne, Loire, Auvergne-Rhône-Alpes, France
116.6km (72.4 miles) V Chessy copper mines, Chessy-les-Mines, Villefranche, Rhône, Auvergne-Rhône-Alpes, France
141.3km (87.8 miles) W Fanay Mine, Razès, Haute-Vienne, Nouvelle-Aquitaine, France
146.0km (90.7 miles) X La Roche, Besanceuil, Bonnay, Mâcon, Saône-et-Loire, Bourgogne-Franche-Comté, France
174.2km (108.2 miles) Y Quincy-sur-Cher, Bourges, Cher, Centre-Val de Loire, France
Mineral and/or Locality  
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