Which type of volcanic glassy stone was often traded over great distances because it could be used to produce very sharp edges?

Question

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Obsidian is a type of volcanic glass that was highly valued in ancient times for its ability to be fractured into pieces with very sharp edges, making it ideal for crafting tools and weapons. Its sharpness and ease of shaping made it a widely traded material.

Which Type of Volcanic Glassy Stone Was Often Traded Over