Answer:
Bright as diamonds, Loud as thunder, Never still, A thing of wonder.
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.
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
Break it and it is better, immediately set and harder to break again.
Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?
What is always coming but never arrives?