Growing Crystals Crystals Crystals have been growing inside the earth for over a billion years. Crystals are still growing miles beneath your feet. A natural crystal takes thousands or even millions of years to grow.
Forces of nature build crystals from atoms and molecules.
Heat a kettle of water. Substances are dissolved in hot water, making them supersaturated. Let the solution cool down. Add a rock to the solution to give the crytals something to attach to and grow on. Excess molecules can't stay dissolved.