Fossil or Rock?

[IndianRiverSonrise]

I posted photos of this item in the Rocks and Gems forum thinking that it was a rock and not a fossil. However, some of the people over there think that it is a fossil, so I am posting it over here.
What do you think?

It might help to know that it was found on a Florida beach where I have never seen a rock like that, but where I have found both fossils and Indian points. When I first picked it up I thought it was a fossil tooth, but after cleaning it off and getting a better look, I thought it was a rock. It seems to be very dense, but the layers are so thin and irregular (curved and wavey), that I doubt it would be used by the Native Americans to make points. Just doesn't look like it would flake well, even though I don't really know much about that.

The guys on the rock and gem forum seem to be going towards a conclusion of chalcedony fossil (if I am fairly summarizing majority opinion).

[Harry Pristis]

It's a section of mastodon molar.

[IndianRiverSonrise]

It's a section of mastodon molar.

Thanks Harry.

[mamabear]

what a great find!! I was waiting to see what Harry or Fossis had to say. are you gonna go back & dig at the same spot?

[IndianRiverSonrise]

what a great find!! I was waiting to see what Harry or Fossis had to say. are you gonna go back & dig at the same spot?

Yep. I'll go back. That white stripe really threw me off for a while.

I'll be looking for his tail the next time, then try to connect them. Just kidding.

[Tuberale]

I'd say fossil, too. Portion of mastodon seems at least possible.

Only seen mammoth locally, but their molars are massive: several pounds each, and 8-9 inches in depth.

[ghost surf]

A Friend found this rock which looks like it has a skull and back hip with right leg bones on the top part of the rock like it's leaning over the rock. bottom photo looks like a back and hip area. Or am I seeing things?