I set my face like a flint because I know I shall not be put to shame.

The landscape was cold and sharp as flint.

What's diamond is diamond, what's flint is flint.

With patience, you can even bore through flint.

Scouts can start a fire using only flint and steel.

Fire glows, burns and consumes to ashes. A spark of it struck from a flint (or firestone) by means of a steel, and taken by tinder in a tinder box, lights a match, and after that a candle, or a stick, and causes a flame, or blaze, which catches hold of houses.

The people who poisoned Flint and other cities for profit should be put on trial for crimes against humanity.

First from a flint a spark Achates drew, / and lit the leaves and dry wood heaped with care / and set the fuel flaming, as he blew.

Sand and gravel are stone broken into bits. A whetstone, flint, marble etcetera are ordinary stones.

Centuries ago, people started fires using flint and steel.