Answer to the Cased in wood from mines Riddle

Answer to the Puzzle of the Day 2191 : Cased in wood from mines Riddle
Here is the refresher to the puzzle

Riddle :

Taken from a mine
and then locked up
in a wooden case.
I am used by students everyday.
What am I?

Now the Answer : 

Answer : Pencil Lead
Explanation :
Lead used in Pencils is actually Graphite which is mined.Then carved into sleek shape and finally cased into wood to create a Pencil.
Which are then used everyday by students to write down on paper.

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