Crack open these real geodes to discover how stones are formed, and find a surprise of beautiful crystals hiding inside an unassuming rock.
These small hollow geodes are composed of various forms of quartz. The inner core is commonly the crystaline variety, while the outer skin is made up of microcrystaline quartz or agate. They are formed from volcanic gas balls which cooled and formed hard outter coatings. The inside is mostly hollow with many crystals that formed when the minerals and gases cooled.
Includes 3 geodes. No two pieces are alike. Each one will slightly vary in size, shape and colour. Hammer or mallet is needed to crack open the geode. Recommended for ages 5 and up. Parental supervision needed.