HYALITE OPAL SPECIMEN
Hyalite Opal Specimen. This piece fluoresces up under short wave ultraviolet light. This is a superb Aussie fluorescent specimen to grace your collection. Rare to come by at this quality. Sits on a perspex pad for display.
Squaretop Mountain, Queensland, Australia.
2.8cm x 2.9cm x 2.8cm, 17g.
SiO2 · nH2O.
A colourless variety of Opal. Hyalite is opal, an amorphous silica glass containing about 3-8% water. Hyalite occurs as globular and botryoidal masses and irregular crusts. Found in volcanic and pegmatite environments where the silica deposits from the gas phase. It often shows a strong green fluorescence in UV light.