Obsidian, Rough Rock, per lb

Rough black Obsidian from Mexico. Obsidian is an organically created glass, formed through felsic lava that rapidly cools after exploding past the earth’s crust. It exhibits conchoidal fracturing and is a hardness of 5 to 5.5 on the Mohs scale. Typical Obsidian is a semi-translucent black that can have slight tints of green or brown.  Size range .2 to 3lbs Primary image features the rock wet. If you have a preference on the size or number of rocks you will receive, please describe this in your order notes at checkout.