Description
Specimen of bayldonite and olivenite crystals from the Voltennes mine at La Petite-Verrière (Morvan). The Voltennes fluorite mine was in operation from 1861 to 1972. Six veins of varying length and power were mined. La Petite-Verrière is a commune in the French department of Saône-et-Loire, in the Bourgogne-Franche-Comté region.
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