@chasseurdesons: The sound of Guildo’s singing stone 🪨 While exploring Brittany, I stumbled upon the fascinating “singing stones” of Saint-Cast-le-Guildo. These dark amphibolite rocks produce a distinctive metallic sound when struck, because they contain more iron than regular stones. Local legend adds its own twist: people say the giant Gargantua left them behind after a rather dramatic case of indigestion. That’s the kind of place where science and folklore meet 🧌 #science #stone #sound #pourtoi #fyp