A stunning specimen of Hyalite Opal from Tarcal, Hungary. Hyalite opal, also known as water opal or glass opal, is a colorless, translucent to transparent form of opal with a glassy luster and high water content. Tarcal, located in the Tokaj wine region of northeastern Hungary, is a classic locality for this rare and eye-catching variety. Formed as a secondary mineral in volcanic rocks, hyalite from Tarcal typically occurs as botryoidal or globular coatings on rhyolitic tuff. Its glass-like appearance and strong green fluorescence under UV light make it especially popular with collectors. The specimens are often water-clear with a smooth, jelly-like surface. Tarcal hyalite opal is notable not only for its aesthetic qualities but also for its well-documented geological context, providing insight into low-temperature silica deposition in volcanic environments. Its purity, clarity, and fluorescence make it one of the most sought-after hyalite opals in the world. Mineral: Opal Locality: Tarcal, Zemplen Mountains, Hungary Size: 1.3 x 1.7 x 1.5 inches Weight: 54g
