English Dictionary

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.
Source : opted (60213)  - auto

A piece of flint for striking fire; -- formerly much used, esp. in the hammers of gun locks.
Source : opted (60214)  - auto

Anything extremely hard, unimpressible, and unyielding, like flint.
Source : opted (60215)  - auto