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how to make eggshell geodes with alum
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Eggshell Geodes

How to make eggshell geode crystals with alum
Author Crystal


  • 3/4 cup alum powder
  • 2 cups water
  • 1 drop gel food coloring


  • Prepare clean eggshell by applying a thin layer of glue to the inside. Sprinkle alum powder over the glue and set to dry.
  • Heat water in a small saucepan until boiling. Pour into a wide jar.
  • Stir in alum powder until it dissolves in the water. Add gel food coloring then let the water cool for 30 minutes.
  • Place the eggshell in the alum water for 12-24 hours. Then carefully remove with a spoon. Allow the geode to dry on a soft towel before handling.


This recipe calls for 3/4 cup of alum powder plus more for sprinkling on the eggshell. The alum water can be reactivated for a new geode by reheating and stirring in 1 tsp of alum powder.