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 ...

The lady who never made it into the game: Uli Booi. Her picture hangs on Obsidian's wall. Photo taken by me. Before the big meeting, Alpha Protocol's infamous mini-games were even worse.

Known as Obsidian Cliff, the Yellowstone mountain is one of the country’s highest quality deposits of “the sharpest natural substance on Earth,” according to Douglas H. MacDonald ...

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 ...