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introduction Obsidian is a natural volcanic glass, which was widely used during prehistoric times as cutting implements probably because it is shiny and attractive, and can be worked easily into implements with razor-sharp edges. Obsidian is formed through relatively fast cooling of high-silica lava domes and flows that are usually very homogeneous in chemical composition. The geological occurrence of obsidian is typically very limited and its homogeneous chemical composition is often highlydoi:10.1353/asi.2010.0000 fatcat:irdosbbqzbde7hblwblwqf7nle