Opal-ANGwernavalou Quarry, Trémargat, Plounévez-Quintin, Côtes-d'Armor, Brittany, France
Photo: P Le Roc'h Abandoned quarry.
Refs.:
- Germain C., Guillou A. (1988), Nouvelles découvertes minéralogiques dans les druses du granite de la carrière de Gwernavalou (Côtes d'Armor), Le Cahier des Micromonteurs, n°3, 3-7
- Germain, C. and Guillou, A. (1985). "Micro-balade : Trémargat." Le Cahier des Micromonteurs(2),pp:3.
Mineral List
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