Barely more than a nick, caused by a sharp stone.
Suddenly his foot turned on a sharp stone and he almost fell.
The first thing is to find a sharp stone to cut through these thongs.
He'd have liked to put a point on each end of the long piece, but there weren't any sharp stones in sight.
As I took a forward step my foot came down on a sharp stone, sending me off balance.
He will write her name, and the date of their first meeting, in the ice with a sharp stone.
There was a rock in her hand, a sharp and pointed stone.
He looked about for a sharp stone with which to open the monkey's body, but could find none.
She would need a sharp stone to cut it open.
He fell with his back against a sharp stone that certainly would have seemed very tiny to a normal man.