Cool Crystal Growing Experiment
Grow your own rock crystals and geodes with this spellbinding science experiment. Geodes are pockets of crystals that form in sedimentary and igneous rocks. They start as hollow spaces in rock that is porous enough for water to seep through. The water carries dissolved minerals, which are deposited in the open space, forming a lining of crystals within the interior of the rock.
This experiment is sure to keep young scientific minds engaged. Some adult supervision and patience is required, as the whole process takes 3-4 days to complete.
In this experiment. you will use the lining if eggshells to simulate a geode-like environment for crystals to grow. You will create a supersaturated solution which is a solution that is forced to hold more atoms in water than it normally should. Crystals form when a supersaturated solution comes in contact with a seed molecule which causes the the other atoms to naturally fall out of the solution and attach to the seed. In this experiment, the seeds are the alum powder that you sprinkles onto the glue to line your eggshell.
How to Do It