Answer:
Long and think, red within, with a nail at the end.
I pass before the sun, but make no shadow.
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
What is given but kept by the giver?
What can be swallowed, But can also swallow you?
I can only be played on a windy day