Agate

This smooth, polished geode from Dialer is intact, filled with brightly coloured concentric agate rings, and is one of the finest specimens of its kind. Geodes occur only in pillow lavas, such as that formed 237-235 millions of years ago on the Seiser Alm plateau due to undersea volcanic eruptions. Geodes may often be recovered by hand, while in other cases they require a pickaxe and crowbar.