From: Dallet, Puy-de-Dôme (63), France - Dimensions: 23x21x16mm - Sold by: Le Comptoir Géologique - Beautiful and rare Helix Ramondi land snail epigenised in blue lussatite opal-CT variety. Really rare transformation described by Lacroix and Lecoq in the mid 19th century. Exceptional item, only for the best collectors.