Geodes with quartz crystals
Geodes are cavities covered on the inside with crystals.
The geodes on this page contain quartz or rock crystal. Geodes are actually gas bubbles trapped in magma in a volcano eruption. After solidification of the magma cheeks in the hollows slowly growing crystals.
The geodes are the bulbs in the ground or in rock formations found. On the outside is often not seen much, but when you open the beautiful crystals are visible.