Egg Geode

Egg Geode

What You’ll Need

  • Egg
  • Paintbrush
  • Glue
  • Food coloring
  • Alum powder (look in the spice section of your local grocers)
  • Water
  • Scissors
  • Paper towels
  • Bowl
  • Beaker/glass
  • Spoon
  • Pushpin

A friend shared this science experiment with me, so I had to try it with my daughter who will be 5 in a few weeks.

First you have to remove the yolk and egg white from the egg by using a pushpin to make a small hole in one end of the egg and a bit larger hole in the other end. Then blow through the egg until all the yolk and egg whites are removed from the big hole.

Then, to get my eggshell in half, I poked a few holes in the egg shell like I was cutting it in half length-wise until I could get my scissors in to finish the process. Once the egg shell is in half, remove any extra shell and use a paper towel to carefully dry the inside of the egg. Then…you wait. We waited about an hour for the inside of the egg to dry completely.


Once the shell is dry on the inside, pour some white glue into the egg and use a paintbrush to coat entirely. Then pour about a tablespoon of alum powder into the shell and make sure it’s fully coated. Pour out the excess. Then…you wait. This time we waited about 5 hours to make sure it was completely dry, but Steve Spangler Science suggests overnight.


Next I added 2 cups of very hot water into my Pyrex measuring cup along with 3/4 cups alum powder and 30 drops food coloring. Mix until combined.




Well, I sank the shell before I got a picture, so I resurrected it so I could show you. Just requires a tiny bit of pressure to get it to sink.

Egg Geode

Then, you wait…The directions said to wait 12-15 hours, but as you see with mine, it crystallized completely instead of the middle being concave. We waited 14 hours.

When I went to remove the eggshell, I had to pour out all the liquid so I could find it.

Overall, this was FUN! My daughter loved helping where she could and is amazed with her crystals.


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