I am taken from a mine and shut up in a wooden case, from which I am never released. What am I?
Category: Brain · Difficulty: hard
Hint: Consider something used for writing.
Answer
Graphite
Explanation
Pencil lead is made of graphite, which is mined, and is encased in wood.
This is a hard brain riddle — a tricky one that takes a little thought. The answer is Graphite.
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