It's this flake, or "preform," that's shaped to create a dagger or arrowhead. An obsidian preform—a flake off a larger obsidian block. An obsidian preform—a flake off a larger obsidian block.

still wear red obsidian arrowheads “for spiritual protection,” said Timothy McCleary, the former archaeologist for the Crow tribe, who now teaches at Little Big Horn College on the Crow ...

Obsidian, a naturally occurring glass formed when lava cools rapidly, is the material of choice for making arrowheads. From a large piece of obsidian, you have to break off a smaller section to ...

In his home in north Spokane, he displayed a selection of chert, flint and obsidian arrowheads he had found as a child. He grew up in Davenport, Washington, and an artifact found near his hometown ...