Fluorescent Hyalite – Water-clear Botryoidal Opal on Matrix – Tarcal, Hungary

Hyalite AKA Muller’s glass, Water Opal, and Jalite, Opal-AN

Dimensions: 57x47x19mm

Weight: 26g

Locality: Kopasz Hill andesite quarry, Tarcal, Tokaj District, Borsod-Abaúj-Zemplén County, Hungary

Formula: SiO₂ · nH₂O

Fluorescence captured under short-wave UV.

Hyalite is a transparent form of opal with a glassy lustre. It may exhibit an internal play of colors if natural inclusions are present.