making crystals out of alum

To make crystals out of alum you need alum, water and 2 rocks. What you do is add alum to a cup of water and stir it until it dissolves. Then put the 2 rocks in. After a couple days it will form crystals.

Salt Crystals

This is a very easy way to make crystal. All you do is put salt in a very little amount of water and let it evaporate.
Isn't that easy?