Geode with quartz crystals
Nice geode with quartz crystals.
Nice piece for your collection
What is a geode?
Geodes are cavities covered on the inside with crystals. In this case, called quartz or also called rock crystal. Geodes are actually gas bubbles trapped in magma in a volcano eruption. After solidification of the magma cheeks are slowly growing crystals in the hollows.
The photos are enlarged to show detail. The last photo is a ruler of the actual size.