Product Details

Dimensions: 8.90 x 6.27 x 4.61 cm. Weight: 8.1 oz (229 g) Locality: San Luis Potosí, Mexico Mineral(s): Hyalite Opal This hyalite opal specimen features clear to translucent botryoidal opal with a bright glassy luster. Under ultraviolet light, the specimen displays a vivid green fluorescence, creating a dramatic contrast to its otherwise subtle appearance in normal lighting. The rounded natural formations and strong UV response make this an eye-catching addition to any collection. ABOUT Hyalite is a transparent variety of opal that forms from silica-rich solutions in volcanic and hydrothermal environments. Specimens from San Luis Potosí, Mexico are especially prized for their strong ultraviolet fluorescence, which is caused by trace amounts of uranium incorporated into the mineral during formation. Despite the fluorescence, these specimens are safe to handle and display. Hyalite opal is popular among collectors for its unique combination of clarity, botryoidal growth, and vibrant UV reaction.