Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
I have hands but cannot clap. What am I?
You heard me before and then again. Afterward I die, until you call me again. What am I?
I can be swallowed, but I can also swallow you. What am I?
Though I am dark Adam married me.
I am your mother's brother's only brother in law. Who am I?