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How to Grow Crystal Geodes

How to grow your own Crystal Geodes with 4 simple kitchen ingredients When you have a 10-year-old who hopes to be a geneticist someday, you can expect your kitchen to serve as an impromptu science lab at any given moment.  Ingredients you planned to use for dinner are suddenly cooked up into any number of experiments, and if you planned to have a clean counter at some point, forget it.

Just to be completely clear, other than keeping the toddler out of the shells for a couple of days, I contributed nothing to this project.  My daughter did everything on her own.  That makes this the perfect experiment for a science fair project, a home school lesson, or just for fun on a boring summer afternoon.

Your kids only need 4 ingredients to complete this stunning experiment, and you won’t have to shop for them at a chemical supply store.  You’ll need:

  • Eggs
  • Salt
  • Water
  • Food Coloring

That’s it.  This one’s a keeper!!  Give your kids the instructions and watch them turn into mad scientists.

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How to Grow your own Salt Crystal Geodes with a few ingredients from your kitchen

How to Grow Crystal Geodes

  1.  Collect several bowls to grow your geodes in.  They will need to be just a touch larger than your eggshells.  We loved the glass bowls because it was so much easier to watch the growth process.DIY Grow your own Crystal Geodes science experiment for kids
  2. Carefully crack several eggs and scramble the innards for lunch.   Take your shells and wash them gently under warm water.  After they are clean, place them in the bowls and a let them dry while you complete the next step.
  3. Boil enough water to fill one bowl.  You can do this over the stove or in the microwave. Once the water is boiling, remove it from the heat and add as much salt as will dissolve in the water.  Once the salt grains stay at the bottom, do not add any more.  Finally, stir in 1-3 drops of food coloring.  Experiment with colors if you’d like.
  4. Pour the colored salt solution over an eggshell.  Pour it into the shell first so it doesn’t float, and then continue to fill the bowl around the eggshell.

    See More of our Fun Science Experiments Here!

    How to Grow your Own Crystal Geodes Simple Science Experiment for Kids

Repeat this process for your additional shells and colors, and then sit back and wait.  Crystals can start growing as early as the next day, but tend to peak several days later.

Take pictures each day as the water evaporates and the crystals grow.  Watch the changes and enjoy the process.  The kids were rushing to the kitchen each morning at our house to check on the crystals.

Once the water has completely evaporated and the geodes are dry, you can display them and show them off at your science fair.  You will need to keep them dry, because water will destroy the salt crystals on the geodes.

Thank you for checking out our How to Grow Crystal Geodes project. Give it a try, and let us know how it goes.

How to Grow Crystal Geodes - Easy recipe.

44 Responses

    1. Thanks for pinning, and I’m glad you liked it. This was seriously simple, and I loved that I didn’t have to hunt down any ingredients. I can do eggs, salt, water and food coloring. 🙂

    1. I couldn’t believe how pretty they were. I wish I was a better photographer. I loved the cool color trails outside the shells of the eggs, and the insides were a total burst of color. Just really amazing all the way around.

  1. These are perfect for my son!!! He will love this! His dad brought him a chemical crystal growing kit thing and was amazed by it. These will make the perfect continuation of the crystal growing. Great post.

    1. That’s awesome. My daughter get’s science kits for Christmas and her birthday’s because she loves experiments. She and her friends burned through the last kit pretty fast, so this was perfect because I didn’t have to go buy anything. I hope your son enjoys it too.

  2. This looks so fun! My daughter loves science and wants to be a scientist and science teacher when she grows up. This would definitely be a cool project to do with her!

    1. This is a good one. My 3-year-old thought it was cool, but was a bit young to understand it much. The 6-10 year olds couldn’t get enough. It’s a pretty great project, and I loved that I didn’t have to go buy anything.

  3. This is such a creative idea. I need to try this with some of the kiddos I nanny. Thanks for sharing!!!

  4. So those look pretty cool! I would like to say I am so doing this with my kids this summer, but I don’t want to set expectations too high.. hehehe 😉

  5. This was so cool I did it and was just going to make one but ended up making 20 my friends are going to love this thank you

      1. Okay thank you! I realised that a seashell didnt really work so right now i just finished making It in an eggshell! I’m still waiting for it to crystalize though :))

  6. I’d like to try this in my classroom of 3rd Graders. Do you think egg shells will be too fragile? Any other suggestions for what might work that might be more durable? Thanks!

    1. You need to use actual eggshells unless you want to add additional chemicals. My kids didn’t have a problem with using them, and they are quite young as well. Best of luck!

      Amy N.

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