This amazing Highest Grade botryoidal Hyalite Opal on Matrix measures approximately 3.5cm x 3cm
Origin: Czech Republic
Hyalite Opals are one of the most unusual variants of Opal: with its glass-like clarity and luster, Hyalites display a dramatic colour change when viewed under UV light.
Hyalite is a form of potch opal that contain safe-level trace inclusions of Uranyl, a residue of Uranium. It is this minute presence that causes a strong fluorescent green glow under longwave UV. Often transparent, these bubble Hyalite specimens are sometimes greenish, and sit atop a brown coloured matrix.