Geode Slice Purple Crystal Wallpaper Royalty-Free Stock Image

Rock slice is illuminated to show off the geode pattern formation. This closeup of sliced geode agate is the most common variety of chalcedony which is a form of quartz. Agate is identical with quartz in composition and physical properties. Most agates occur in cavities of eruptive rocks or ancient lavas forming geodes filled with Quartz. Agate is Quartz with impurities causing the many different patterns.