Natural crystals are solid materials where atoms are arranged in a highly ordered, repeating pattern. They form through various geological processes, such as cooling magma or evaporating mineral-rich water. Common examples include quartz, amethyst, and calcite. Each type of crystal has unique properties, such as color, hardness, and luster, which are determined by its chemical composition and structure. These crystals are often found in nature, embedded in rocks or as part of mineral deposits. Many people collect natural crystals for their beauty or believed metaphysical properties. Additionally, they are used in various applications, including electronics, jewelry, and healing practices.