Opal (Var: Forcherite)
Mineral spring, Saint-Nectaire, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Forcherite opal variety on granite matrix, beautiful yellow color due to orpiment inclusions. Old specimen.
Dimensions : 4,7 x 4,7 x 1,3 cm environ
Saint-Nectaire, Puy-de-Dôme (63), France
Foto Comptoir Géologique
Collection Thierry Tillier