Answer :
The volcanic glass used to make chipped stone tools is a particularly good material to perform trace-element analysis, and the used volcanic glass is also known as Obsidian.
The characterization of prehistoric bone has been carried out using trace element analysis and neutron activation. Strontium and barium, two alkaline earth elements, seem to be accurate markers of bone origin.
Obsidian is a naturally occurring, glassy volcanic substance that develops as massive, swiftly cooling lava flows or on the borders of lava domes. It is widespread throughout the world. Obsidian has been used to make mirrors, tools, decorations, and weapons throughout history. Obsidian, with its conchoidal fracture, which has smooth curved surfaces and sharp edges, was used to make the sharpest stone objects.
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