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Product Description
Obsidian and Cristobalite Mineral Specimen Rough Rock California
This natural unpolished rough rock black Obsidian with Cristobalite inclusions is 5.4 inches by 3.6 inches and 2.4 inches thick.
Obsidian and Cristobalite found in Canyon Butte, Siskiyou County, in California.
Cristobalite is a mineral that is almost always associated with the natural glass rock obsidian. Obsidian cools too quickly to crystallize, so it is unusual to see minerals attached.
The "eyes" or spherulites (spheres) of high temperature cristobalite are actually the result of devitrification, or loss of silica from the obsidian.
Obsidian is a natural volcanic glass. This glassy, lustrous mineral is found in lava flows.
Obsidian is important to many ancient cultures. It was one of the major barter materials, and has been used since prehistoric times for making tools, masks, weapons, mirrors and jewelry.
Obsidian was named after a Roman-Obsius.
