Crystal Rock Garden

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Total Time 1 hour Ages all-ages

Growing this garden couldn't be easier: It never needs watering or weeding, and you end up with a bumper crop of cool crystals.

What you'll need

  • Water
  • Alum (found in the spice section of supermarkets)
  • Clear glass bowl
  • Clean rocks and pebbles

How to make it

  1. Bring 1/2 cup of water to a boil. Add 2 ounces of alum, stirring until the alum is dissolved.

  2. Pour the solution into a clear glass bowl half filled with assorted clean rocks and pebbles. Within hours you should be able to see alum crystals forming as glasslike squares. Within several days you should have a number of crystals to look at.

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