First of all, crystal is a transparent or translucent mineral, usually colorless or light yellow. Its chemical composition is silicon oxide, that is, silicon dioxide (SiO2). There are many kinds of crystals, such as seasonal crystals, amethyst and seasonal roses. Crystal has high hardness, toughness and good optical properties, and can be used to make jewelry, decorations and optical devices.
Fluorite is a fluorine-containing ore, and its chemical composition is calcium fluoride (CaF2). It usually appears in different colors such as colorless, white, yellow, purple or green. Fluorite often presents transparent or translucent crystals or blocks in appearance. The hardness and brittleness are moderate, and it will emit a unique fluorescence phenomenon under ultraviolet irradiation. Based on this characteristic, fluorite is often used to manufacture fluorescent lamps, display screens and X-ray equipment.
To sum up, there are some differences between crystal and fluorite in appearance, chemical composition and use.