You Cannot Solve This Riddle

"I m tkn from min, nd shut up in woodn cs, from which I m nvr rlsd, and yt I m usd by lmost vrybody. Wht m I?"
"E"s and "A"s have been withdrawn from the riddle! Guess the answer!
I will tell the answer tomorrow.

'I am taken from a mine, and shut up in a wooden case, from which I am never released, yet I am used by almost everybody. What am I?'

Someone guess the answer

Oil? Isn’t like oil used in almost everything?

Pencil lead?

Continue to guess, please!

Petrol or oil?

"never released from a wooden case" ?

Pencil lead.