The excavation of the Jacksonville "Blue China" wreck site yielded a single grindstone recovered from the starboard bows of the wreck. It features chamfered edges and a square aperture cut through the center for mounting on a rotating axis. The grindstone was probably used by the ship’s carpenter or boson for sharpening tools. The medium is very coarse and one-quarter of the front side is delaminated and has broken away. Chisel marks are visible across the entire outer edge, with blade widths of 0.3cm. The stone composition has been identified as being quartzitic sandstone. All of the grains are similar in size, which makes the surface highly homogeneous. The rock most probably originates on the west flank of the Appalachian Mountains between New York and Alabama.