Answer:
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
What gets bigger the more you take away?
I am a king who's good at measuring stuff. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.