Mineral: Opal-CT (variety lussatite) after fossil (Helix ramondi)
Locality: Les Rois Mine, Mur-sur-Allier, Pont-du-Château, Clermont-Ferrand District, Puy-de-Dôme Department, Auvergne-Rhône-Alpes, France
Dimensions: 92 mm x 45 mm x 39 mm

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