The term "natural crystal" refers to a type of mineral that is formed through natural geological processes. These are typically formed when there is an excess of certain elements in water or other fluids, which then precipitate out of solution and form crystals over time. Natural crystals can be found all around the world and come in many different shapes, sizes, and colors depending on their chemical composition. They are often valued for their beauty and rarity, as well as their metaphysical properties.