Your item appears to be a "celt". These can be many sizes, of many stone types, and had many uses. Some were used hafted and some weren't. Size reference in photos helps. I have little ones barely an inch long and larger ones up to 7" long. Yours sadly appears to have a badly chipped cutting edge. Celts can be found on all continents except Antarctica and were used by most paleo cultures. Cool find in a box of "stuff"!