Obsidian Sphere Ball Russia Siberia

$99.00

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Description

OBSIDIAN SPHERE

This is the motley obsidian sphere. Diameter 2.1″ (54mm). Weight – 6.5oz (184 grams). Origin: Russia, Siberia.

Some information about obsidian:

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.

Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) causes a high viscosity, which, upon rapid cooling, results in a natural glass forming from the lava. The inhibition of atomic diffusion through this highly viscous lava explains the lack of crystal growth.

Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.

Additional information

Weight 184 g