Fossil, Geode or both?

[Rosekat324]

I found this a while ago. I believe it is a geode and a fossil. Within the rib, there is crystal the looks quartz to me and at the top of the stone, looks like there may be bone. I would appreciate any and all thoughts

 

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[old digger]

I believe you have a fossil cronoid. A lot of fossils contain crystalline crystals from the process of fossilization.

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[loco oro]

There are mineral fossils as well ,here is a dissolved unknown mineral,likely limestone with a tiny quartz stringer,softer minerals dissolve leaving the tougher quartz behind View attachment 1561429