Answer:
I am the type of room you cannot enter or leave. Raise from the ground below I could be poisonous or a delicious treat.
I am often sold by children entrepreneurs in summer time
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
I can be red blue purple and green. No one can reach me not even the queen.
I can go through glass without breaking it.
A little house full of meat, no door to go in and eat.