Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
What is so delicate that saying its name breaks it?
I hold two meanings. With one I may be broken with the other I hold on.
I'm very tempting so its said I have a shiny coat of red and my flesh is white beneath. I smell so sweet taste good to eat and help to guard your teeth.
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?