Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
Mr. Red lives in the red house. Mr. Blue lives in the blue house. Mrs. Pink lives in the pink house. Who lives in the white house?
I pass before the sun but make no shadow. What am I?
I work when I play and play when I work. What am I?
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.