It looks like any other stone to the untrained eye.
But in these parts stone tools are plentiful and can be picked up pretty much anywhere, where there has been some digging done.
It is recognized by the fact that the left side in picture has some flakes removed to produce a sharpened edge. The right side in picture is still untouched with its naturally rounded corners and edges.
This type of stone artifact was manufactured from a couple of million years ago till about 100 000 years ago, so it could have been manufactured at any time during that period.
This type of tool is called a chopper, since it was generally used in a chopping motion.
This particular tool was made for use by a right handed person sits it fits very comfortably in the right hand but not so in the left.
No picture or location???