Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
I have an eye but I cannot see. What am I?
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
I am a small paradise surrounded by dryness and heat. What am I?
If you look, you cannot see me. And if you see me, you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. What am I?
The answer I give is yes, but what I mean is no. What was the question?