Since the obsidian was easy to break, pieces of it were carved to make knives used in surgical procedures.

As a souvenir from the eruption of Mount St. Helens, I kept a chunk of the obsidian that was left from the historical flow.

With a solid black color, the obsidian could be easily spotted in the earth by its simple monochromatic color.

Geologists unearthed a pile of shards of obsidian as they dug at the site of a famous ancient volcanic eruption.

Using as a paperweight, the hard obsidian had been shaped and smoothed by a heavy duty sander.