This remarkable 11-cm-wide geode with quartz comes from the Dialer Bohlen area between the Sasso Piatto and Denti di Terra Rossa mountains. This area is famous for its geodes with varieties of quartz often featuring intensive colours. Geodes are formed when hot solutions and gases in hollows contained in pillow lavas crystalize to produce a variety of different minerals. 

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 million 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.

This two-part, 23-cm-high geode with smoky quartz, calcite and geothite was found in the partially rocky mountain pastures at Gardejea - Curasòa and is an impressive example of the minerals of volcanic origin found on the Seiser Alm plateau. This splendid geode dates back to a time between 237 and 235 million years ago, when lava streams full of bubbles coming from the earth's interior collected on sea beds.