Silexes are hard rocks that are made of a kind of stone.
Silexes are usually seen as strong and durable.
Examples:
I found some shiny silexes near the river.
The ancient people used silexes to make tools.
She collected colorful silexes from the beach.
The silexes in the cave looked like little jewels.
The silexes in the museum were as big as my head.
I tripped over a silex and hurt my foot.