Obsidian

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.

Pliny’s Natural History features volcanic glass called “Obsidianus”, so named from its resemblance to a stone found in Ethiopia by one Obsius.

Obsidian was valued in Stone Age cultures because, like flint, it could be fractured to produce sharp blades or arrowheads.

Comments are closed.