A Little Piece of Mercury on Earth?

jonerik writes "While the discovery of meteorites believed to have originated on Mars is almost commonplace these days, the BBC is reporting the discovery of what is believed to be the first known chunk of the planet Mercury found on the Earth. The rock - actually discovered in 1999 and dubbed NWA 011 - has certain characteristics which lead experts to believe that it came from a body larger than an asteroid, and specifically from a planet."