Boy I don't know. To me it has some looks of a sharks tooth and some of it doesn't look like the tooth of a shark. I'm leaning towards it being a piece bone fragment.
Looks like the bone inside the hoof of a cloven hoofed animal, perhaps deer, antelope, mountain goat or sheep. On a horse that would be the "coffin bone." The distal phalanx, relates to the last bone in your finger, the bone under your finger nail.
Here's a couple of pictures. These are deer feet, note the cloven foot, under each of
those pointed hoof walls there is a bone. The pastern bones would be doubled.
This side view shows the bone in the toe, but doesn't show the pastern bones. I know a little about a horses foot, but on cloven hoofed critters I don't know what they
call the bones. On a horse there would be the coffin bone, then the short pastern, long pastern, then the cannon bone and those aren't shown in the diagram of the sheep's foot diagram. On a cloven hoof I think there are 2 short and 2 long pastern bones, and then one cannon bone.