Obsidian can be used to produce a cutting edge that is thinner and sharper than the best surgical steel. Making arrowheads, spear points, knife blades, and scrapers from obsidian, chert, or flint might have been the world's first'manufacturing industry'. Some of these sites have enough waste debris to suggest that many people laboured there for decades producing a variety of obsidian objects. ![]() At some locations, tonnes of obsidian flakes reveal the presence of ancient ‘factories’. The manufacture of obsidian tools by humans dates back to the Stone Age. ![]() where lava cools while airborne (extrusive). ![]()
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