In addition to black, colors reported atop the cliff include brown, red, mahogany, gray and green. In Idaho, west of Yellowstone, Bear Gulch has a comparable high-quality obsidian, although it is ...

An explosive volcanic eruption in Chile has given scientists the first direct insight into the strange motion of rocky lava known as obsidian flow. Rather than a red river of molten rock oozing ...

Rihanna and A$AP Rocky may be two of the best-dressed people in music — but it wasn’t always that way. A$AP Rocky’s first-ever red carpet appearance was at the ...