C-type asteroid
The largest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the largest asteroid, 1 Ceres, here as well, because that scheme lacks a G-type.
94 Aurora
Aurora (minor planet designation: 94 Aurora) is one of the largest main-belt asteroids. With an albedo of only 0.04, it is darker than soot, and has a primitive compositions consisting of carbonaceous material. It was discovered by J. C. Watson on September 6, 1867, in Ann Arbor, and named after Aurora, the Roman goddess of the dawn.