Iron concretion rock specimen with a hole in it.Feels heavier than it should,so as a non expert I've always wondered what it was.At one time I thought iron ore,or some other kind of metal ore,or even an iron meteor?No clue,its neat,and heavier than a normal every day rock or mineral.Size about 3.20 in wide,2.5 in tall,give or take.I displayed it on a shelf,very unusual in my book.