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Obsidian glass
Obsidian glass is a naturally occurring rare volcanic mineral formed as an extrusive igneous rock.
During the fifth century BCE, the Cyclops of Kephallonia had a prosthetic eye made of obsidian glass. The Spartan misthios Kassandra infiltrated Cyclops' lair and stole the eye on the advice of Markos.[1]
During the Peloponnesian War, Kassandra gathered obsidian glass and used it to better her gear.[2]