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