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10 March, 02:14

Which was used by early man to make arrowheads, is a naturally occurring glass

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  1. 10 March, 02:15
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    Obsidian was valued in the Stone Age cultures because, it could be fractured to produce sharp blades or arrowheads. Like glass, obsidian breaks with a characteristic conchoidal fracture. It was also polished to create early mirrors.
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