Polished Celestial Eye Sphere - Mexico - Polished Sphere 7.8 cm / 602 g / BB484

Obsidian is a volcanic rock primarily composed of silica. Its main characteristics are its hardness and sharpness (due to its natural conchoidal fracture), which led to its use in prehistory as a tool or weapon (knife blades or arrowheads). Obsidian is generally a deep, glossy black. White spherulites, composed of acicular crystals, produce snowflake obsidian. Obsidians exhibiting iridescent, rainbow-like reflections are called Celestial Eye .