Obsidian Knife

  • $37.80


Hand carved obsidian knife.

Length: 6 inches

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. These flows have a high content of silica, which gives them a high viscosity. The high viscosity inhibits atomic diffusion through the lava, which inhibits nucleation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava.

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