Description
Bracelet made of Black Obsidian with 8 mm spheres.
Obsidian is a naturally occurring volcanic glass. Obsidian is hard and brittle, and it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.
… among the various forms of glass we may reckon Obsidian glass, a substance very similar to the stone found by Obsidius in Ethiopia.
—Pliny the Elder, Naturalis Historia 36,67 (AD 77)
