Homemade Geodes (with Update!)

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 A couple of week ago we decided to make our own geodes, loosely following the directions from Those Northern Skies. 

I had a hard time, however, gathering enough eggshells, so I decided to try them with plastic eggs. I didn't know whether they would form on the plastic, but I thought it was worth a try.  

Green and blue eggs are Epsom Salts, purple and orange are table salt, and yellow and pink are Borax.

A week and a half later, our geodes are crystallized and ready to show you.

Open them up and this is what you see.

These are the Borax crystals.

These are the table salt crystals.

These are the Epsom Salts crystals.

The one side of the Epsom salt "geode" made one very large crystal.

The rest of the Epsom salt crystals were like this.

We also put some Borax crystals in a regular egg for comparison. The crystals were thicker in the real egg, but even so, I thought the plastic eggs were successful and the boys like pretending they are geodes and "cracking" them open.