Since it's born out of molten rock, obsidian is only found in volcanic regions of the world, including in parts of the United States, such as the Mountain West, Southwest, California, Oregon ...

As with other forms of obsidian, rainbow obsidian is both rock and glass ... which has a long history of volcanic activity. There are four mines in this region that, with a permit, allow the ...

Obsidian, formed by the rapid cooling of volcanic magma, is ideally suited for this second method ... This is because they have some larger crystals in the rock that makes the obsidian fracture less ...

“Adjacent to this open-air workshop, just up above it on the hillside, was a beautiful rock shelter. . . . I just had a gut feeling that it was the kind [of site] I had been looking for.” A decade ...