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You can grow an underwater chemical garden while you watch.

Sodium silicate is the 'secret' ingredient in Magic Rocks that allows you to grow an underwater crystal garden while you watch.

Anne Helmenstine
You can make your own Magic Rocks or you can purchase them. Making your own is a relatively advanced project, plus Magic Rocks are inexpensive, so although I'm usually a do-it-yourself type, this is one case where I'd recommend buying the project rather than gathering all the materials yourself.
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