Could someone tell me what this stone might be It is 9 1/2 inches by 3 1/2 inches and weighs about 5 lbs. it was at this house in Florida when we bought it. It has a white 1/4 inch crust and the interior color looks somewhat topaz.
Most likely some form of chalcedony, not knowing where you found it, I'd call it flint, a form of chert.