Diamond may also be a similar substance, for I believe I've read that, though they are the "hardest" substance on earth, they can still quite easily be crushed with a hammer. Again, though, I may be mistaken about this.
Yes and no. It depends on how the diamond is hit. Being crystalline it has what is referred to as flaw lines. These are the areas where it can be crushed or cut per the trade.
For another example of a strong material think of bamboo. It has great strength in one direction, but in the other it really isn't near as strong.
So conceivably a double door of some type would increase the strength in one direction.
Another possiblity is to simply put the door where it doesn't lead to anything and then have a 'hidden' door nearby. How many player's can resist trying to open a door that is just there. Now once they discover it doesn't lead anywhere they will do one of tow things - look for another door or (as the Knights of the Dinner Table strip had) keep on looking "This tunnel must lead somewhere I know it. No it is just for color. No, the DM must be hiding something we'll keep on digging."
So put the real door in another room.
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