The largest known E-type chondrite in the asteroid belt may be 21 Lutetia, with a diameter of approximately 100 kilometers , Lutetia: A rare survivor from the birth of Earth, by ESO, Garching, Germany, Published: November 14, 2011  based on observations from the Rosetta spacecraft, ESO's New Technology Telescope, NASA Infrared Telescope Facility, and the Spitzer Space Telescope.