Obsidian, Cristobalite & Fayalite C (4.5")
This is a real obsidian specimen, featuring inclusions of cristobalite and fayalite!
These were mined in Cougar Butte, California.
Obsidian is volcanic glass and has been used as material for stone tools all across the globe and by various cultures.
This specimen measures ~4.5" long and can be shipped worldwide.