The cutting tool was characterized by intercrystalline fracture attributed to fatigue and partial cleavage fracture in the machining process.
an alloy steel that remains hard at a red heat; used to make metal-cutting tools.
It thus has a wide range of USES, from abrasives and cutting tools to bullet-proof vests and ceramic brakes in sports cars.
These Paleo-Indians, of the Clovis culture, used the significant amounts of obsidian found in the park to make such cutting tools and weapons.
