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Rough Rainbow 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, but Rainbow Obsidian has inclusions of hedenbergite that create greens, blues, and purples in the light.
Size ranges .2lbs to 5lbs, approximately 1" - 7"
Pictures show the rock wet and dry.
If you have a preference on the size or number of rocks you will receive, please describe this in your order notes at checkout.