Cobble Creek: Chunk of Obsidian Raw Rough Natural from Mexico

Cobble Creek: Chunk of Obsidian Raw Rough Natural from Mexico

$7.99

Cobble Creek: Chunk of Obsidian Raw Rough Natural from Mexico


Always loved Obsidian. This is a great chunk of all natural, rough, raw Obsidian from Mexico. Great for science class, collecting or the talented carving folks out there. The piece in the photo is the piece you will receive.

Height: 2.5" inches / 65 mm
Depth:1.7" inches / 43 mm
Length: 3.7" inches / 96 mm

Weight: 377 grams / 13.3 ounces
Country of Origin: Mexico


From wikipedia:
https://en.wikipedia.org/wiki/Obsidian

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.[4][5]

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) induces a high degree of viscosity and polymerization of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Obsidian is hard and brittle and therefore fractures with very sharp edges. In the past it was used to manufacture cutting and piercing tools and it has been used experimentally as surgical scalpel blades.[6]

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