Activity Category:

Activity Equipment:


  • Eggs
  • Salt (in your Activity Bag)
  • Water
  • Food Coloring


Step 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.


Step 2:

Carefully crack several eggs. Save the shells and scramble the innards for lunch.  

Step 3:

Take your shells and wash them gently under warm water.  After they are clean, place them in the bowls and  let them dry while you complete the next step.

Step 4:

Boil enough water to fill one bowl. You may need an adult to help with this.  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.

Step 5:

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.


Wait and Watch to see what happens !


The water will slowly evaporate over a week or so and the salt crystals will form in the egg shell!

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Other Portable Playscheme Activities: