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 ...

Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast prehistoric trade networks that once cut across western North America.

We all squint, looking for chips of rock someone carried from a volcanic mountain in middle Alaska, 95 miles east of us, father up the Koyukuk River valley. The obsidian rock found here was from ...

Researchers analyzed 788 obsidian artifacts from Tenochtitlan, revealing that the Mexica (Aztec) Empire sourced this important material from at least eight different locations, including regions ...

Known as Obsidian Cliff, the Yellowstone mountain ... But the analysis showed that the volcanic glass came from seven places, including Nemrut Dağ, a dormant volcano that was more than 1,000 ...