Just when it seemed the forest would never end, I arrived at a rock wall, the base of the Obsidian Cliffs. After a couple of switchbacks up the rocks, the trail led me to a high point that ...

As with other forms of obsidian, rainbow obsidian is both rock and glass. However, this isn’t the same kind of glass that’s used in your nice new French doors. It’s far more badass ...

Just when it seemed the forest would never end, I arrived at a rock wall, the base of the Obsidian Cliffs. After a couple of switchbacks up the rocks, the trail led me to a high point that ...

This common type of rock (look at any wall in Yosemite) is filled with different minerals, like grey quartz and pinkish feldspar. A fat slab of earthly obsidian. So, if one needs to hastily find ...

Obsidian is a black, often translucent rock. Volcanic eruptions sometimes ooze out magma that turns into this natural glass as it cools. Obsidian is hard, durable and can be worked to a razor ...

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 ...