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:
- 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 Crystal Geodes
- 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.
- 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.
- 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.
- 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!
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.