You see crystals about every day. Here are some examples of crystals at home: salt, sugar, baking soda, baking powder, and medicine. Crystals are also found in gemstones and geodes.
You can make your own crystals. Here is a recipe for one way you can grow your own crystals. Here are the ingredients: put 3 tablespoons of water, bluing, and salt into a jar. Mix together by stirring. Then add 1 tablespoon of ammonia. Then get rocks, charcoal, and a container. Place rocks and a small piece of broken charcoal into the container. Spoon in the ingredients in the jar and wait 1 day.