Asteroid 1998 QE2 was observed in depth when it recently flew by our planet. Some of the observations have revealed that this space rock is unlike any other that has been observed flying by. QE2 is very dark, red and primitive in surface composition, meaning it has not been heated or melted.
There are no meteorites in our possession that match up to QE2 either. So in the words of the scientists who studied this big boy, "It is an entirely new type of beast".
Read More About It Here: http://www.usra.edu/news/pr/2013/arecibo_radar/
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