This is a Stunning Botryoidal Hyalite Opal specimen which glows a magical green under a uv light, which we also sell here: UV Light
This could be the centerpiece of a stunning necklace or pendant or even ring.
Hyalite is a form of Opal with a glassy and clear appearance which may exhibit an internal play of colors if natural inclusions are present. It is also called Muller's glass, water opal and jalite. The name Müller's glass derived from the name of its discoverer, Franz-Joseph Müller von Reichenstein.
Hyalite's Mohs hardness is 5.5 to 6 and has a specific gravity of 1.9 - 2.1. It has no planes of cleavage but fractures conchoidally, is clear or translucent and has a globular structure. Its luster is vitreous and its streak is white. Hyalite is an amorphous form of silica (SiO2) formed as a volcanic sublimate in volcanic or pegmatic rock and is therefore considered a mineraloid. It contains 3 - 8% water, either as a silanol group or in molecular form.
Size: 27 x 20 x 16mm
Weight: 6.26g / 31.3ct