bubble in a coin?

sorry no photos yet, a guy i work with sometimes showed me a quarter today that had what would be described as bubbling i think. like a mini ball hammer hitting a coin but not doing any damage to the side of the coin you hit but the opposite side being bubbled out. or the nickel and copper layers weren't bonded together and they separated. anybody hear of something like this? I told him to join the forum and post photos of it, hopefully he will because i know people like to say "we need photos".

 

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Plating bubbles or a lamination error maybe. You may be able to find a example here: http://error-ref.com/

 

The bubble coins I've came across were due to extreme heat(inside a fire) the heat causes the bubble to form.

 

I thought lamination was when a piece of the coin was missing or peeling back, this has no indication of being in a fire, being buried, or being hit with anything. Hopefully he will post some photos but even then it will probably be hard to see.

 

Does it look like this?

I bought this from a coin shop. It was sold to me as a mint error but folks here educated me. it was worth the $2.50 tuition and remains in the collection as a reference piece. Very handy in times such as this.

 

Man that coin is really buggered up.

 

he gave me the quarter today so here are some photos. is it possible the nickel layer just had some dirt in it?
I am not an error person by any means and I know it isn't worth but twenty five cents (I'm assuming) but i am curious to what caused this. the rim photo is of where the bubble area is on the obverse, there are no rim dings. could heat have done this?

 

It happens to half dollars also..

http://www.cointalk.com/t224889/

 

I just don't see fire being the case here

 

Doesn't really look like anything that happened at the mint to me.
Keep up the hunt!

 

You will notice that the design follows the raised contours of the bubble and the collapsed bubble. That can't be done with the basically flat die faces. If the bubble had been there before the strike the die faces would have crushed them flat. If something solid had been inside the planchet it would have been crushed by the rollers that rolled out the strip or squeezed out of the strip leaving a hole. If it had some how been in the planchet when struck, once again it would have either have been crushed or would have poked through. And if it wasn't crushed it would have prevented the die from striking up details around the lump.