Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
We applaud if you perform well.
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
I have every color but no gold.
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
What language does a billboard speak?