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Each volcano and in some cases each volcanic eruption produces a distinguishable type of obsidian, making it possible for archaeologists to trace the origins of a particular artifact.

A zoomorphic vessel found at the Temple of the Feathered Serpent (Serpiente Emplumada) at the Teotihuacan complex in Mexico City 

Nature's gems

Acquamarina (varietà i Berillo) with muscovite Nagar, Hunza Valley, Gilgit District, Northern Pakistan. 320x180 mm