Bring 1/2 C. of water to a boil, then add 2 ounces of alum (found in the canning or spice sections of super markets), stirring until the alum is dissolved.
Pour the solution into a clear glass bowl, half filled with assorted clean rocks and pebbles. With in hours you should be able to see alum crystals forming as glass like squares. Within several days you should have a number of crystals to look at.
*Note: Geodes and many other rock crystals were formed the same way, when water saturated with materials seeped into spaces in rocks. When the liquid evaporated, the crystals were left behind.
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