Flint

1.

(a hard stone., apiece of this, a very hard quartz, usually gray, that produces sparks when struck against, which readily produces fire when struck with steel, a prehistoric stone weapon) ថ្ម (ដែកកេះ)

1.

A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.

2.

A piece of flint for striking fire; -- formerly much used, esp. in the hammers of gun locks.

3.

Anything extremely hard, unimpressible, and unyielding, like flint.