A bluish-gray basalt mano end-fragment, later reused as a possible mortar as a hole has been ground into the center of the fragment's flat side. A typical LB mano with one rounded and one flattened side. Light brown corrosion is present across 50% of all surfaces, but closer to 70% on the flat side and 100% in the mortar hole itself.
Retouch:
Patination: