Geode with quartz, green celadonite and geothite

This remarkable 11-cm-wide geode with quartz comes form the Dialer Bohlen area between the Plattkofel and Rosszähnen 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.