Blue fluorite-included quartz is rare due to the precise and uncommon geological conditions required for its formation. Fluorite (CaF₂) crystallizes in lower-temperature hydrothermal veins, while quartz (SiO₂) forms under a broader range of conditions, typically at higher temperatures. For blue fluorite to be encapsulated within quartz, both minerals must crystallize simultaneously in a shared hydrothermal environment with unique chemical compositions and pressures. The blue coloration of fluorite arises from trace impurities, such as yttrium or rare earth elements, combined with exposure to specific radiation or structural defects. These factors align infrequently in nature, making blue fluorite-included quartz an exceptional rarity.