Geodes were formed millions of years ago when the Earth’s crust was still in a molten state. Round gas pockets in the volatile magma provided places for minerals to be deposited later, after the magma cooled and became solid rock. These round deposits of quartz and other minerals are called geodes.
To crack it open, place the geode on the concrete and hit it gently with a hammer until it breaks open. Safety tip: If you don’t have eye protection, cover the geode with an old rag or put it inside an old sock as you break it open. Recommended for children ages 8 and up.
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