What is the method of how to open them? Do you need to have a separate tool for that?

The best way to open them is to take a large file & carefully cut a groove around the Geode along any depressions in the shape. Place in on a towel on a concrete floor. Be sure to put on safety glasses! Take a large chisel and place it in the groove. Strike the end of the chisel with a hammer to break the Geode open. Be careful everyone standing near has their safety gasses on as well!

Can use a sharp,big knife or if not, what do you use

Please do not even consider attempting this with a knife. That is an E.R. trip in the making. We were quite successful with a hammer and wide chisel.

Does the item include a hammer?

If you don't already have a hammer, this item is not for you.

They are real just not real impressive. You're better off to buy bigger geodes online. The kit has nothing spectacular you need. My package was full of solid rocks. Took a 5 lb sledge to get the apart. 100% waste of money.

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💎 Crack open curiosity, wear your goggles, and join the crystal discovery club!

STEM LEARNING MADE FUN - Dive into geology with a detailed 16-page full-color guide that transforms curiosity into knowledge and sparks lifelong passion.
SAFETY MEETS ADVENTURE - Includes durable goggles so you can explore geology hands-on without worry—science has never been this safe or thrilling.
CURATED CRYSTAL VARIETY - Hand-selected geodes ensure a vibrant mix of crystal types and colors, making each kit uniquely mesmerizing.
UNLEASH HIDDEN CRYSTAL TREASURES - Break open real geodes and discover dazzling natural crystals inside—every crack reveals a new surprise!
AWARD WINNING EDUCATIONAL EXCELLENCE - From the creators honored with Toy of the Year, this kit blends imagination, creativity, and science for the ultimate STEM gift.

The National Geographic Break Open 10 Premium Geodes kit offers 10 hand-selected natural geodes ranging from ping-pong to tennis ball size, complete with protective goggles and two display stands. Featuring a 16-page full-color STEM guide, this award-winning educational kit provides a safe, hands-on geology experience perfect for kids eager to explore crystal formations and deepen their scientific understanding.

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