Hyalite Opal Specimen L [San Luis Potosi, Mexico] #8

These captivating specimens showcase Blue Hyalite Opal, a unique variety of opal found in Mexico. This opal is distinguished by its translucent, glassy appearance and a delicate, often pale blue hue. A notable characteristic of Mexican Blue Hyalite Opal is its fluorescence under ultraviolet (UV) light. This fluorescence is caused by trace amounts of uranyl ions incorporated into the silica structure during its formation. When exposed to UV light, the uranyl ions absorb the energy and re-emit it as visible light, typically a bright green or yellow glow. The intensity of the fluorescence varies depending on the concentration of uranyl ions present.