What gives fluorite its color?

Fluorite's color is primarily due to the presence of various impurities and defects in its crystal lattice. These impurities can include elements like iron, manganese, or other transition metals, which can absorb certain wavelengths of light, resulting in different colors. Additionally, the presence of radiation can cause color zoning or changes in hue within the same crystal. As a result, fluorite can appear in a wide range of colors, including purple, green, blue, yellow, and clear.