Cristobalite, Fayalite

Unknown Owner

Help improve this recordNo owner is registered for this specimen yet. If it's yours or you know more about it, you can add the owner, provenance, publications and other details.

Obsidian(volcanic glass) cools too quickly, to crystallize. Thus, it is unusual to see minerals attached. The spheres of high temperature cristobalite(SiO2) are actually the result of devitrification, or loss of silica from the obsidian. Most unusual. 5.9 x 3.8 x 3.8 cm