This resource looks at what are crystals and how do they form?
A crystal is a solid material with atoms and molecules that are arranged in a consistent repeating pattern. Crystals can be expensive and beautiful, like amethysts or diamonds. Or they can be found in your kitchen in the form of sugar and salt. Your class can easily grow crystals by adding a crystal-forming chemical to water and waiting for the water to cool or evaporate.
You’ll find five different methods for how to grow crystals. Science experiments with instructions are provided for each.