Homeschool Science: Geode Project


We’ve all admired the beautiful crystals that form inside of geodes. This project explores just how they grow and form. With just a few simple kitchen ingredients, your child can create their own crystals. Here’s how it works:

1. What you’ll need: As we mentioned, all you need is some basic kitchen items. This includes 3 eggs, food coloring, table salt, sugar, baking soda, hot water, and a cupcake pan.

2. What to do: The process is super simple and easy.

  • First, have your child crack the top off of each egg and empty and clean out the bottom halves of the eggshells.
  • Next, pad three sections of the cupcake pan to hold the shells upright and in place. Tissues or paper towels will work just fine.
  • In each egg place ¼ cup of water and 1 drop of food coloring (a different color for each egg works best). Then, in the first egg add ⅛ cup of sugar. In the second, add ⅛ cup of salt. In the third, add ⅛ cup of baking soda.
  • Over the next five days have your child observe and track the growth of their crystals. On the fifth day, have them assess which combination grew the most crystals. And you’re all done!

3. What they’ll learn: Crystals form in geodes because of minerals dripping into hollow spaces in the earth. The minerals harden into an outer shell, but they also grow on the inside of the shell, forming crystals. The different combinations in this project mimic different minerals and the eggshell represent the hardened outer shell.

Good luck with your crystals and check out the science subjects on SD Accelerate. Sign up for our free two month promo here!