Large fragment of a basalt mano. Tool is bluish-gray in color with light amounts of white corrosion on all sides and some black discoloration, possibly from burning, on both the flat and rounded sides. It possible that this tool is complete, at the "fracture" end is rounded and smooth. Black discoloration on the flat side is shiny and most likely to the result of grinding use. It may be possible to due trace/usage analysis with this object.