Seabiscuit fossils crystalizing

[CindyLoo68 0]

I am wondering if anybody else has ever come across a fossilized Seabiscuit that is showing some form of crystallization

[Al Dente 4,558]

That is a common occurrence. The part where it isn't translucent is filled with sediment. The rest was hollow until groundwater deposited calcite, filling the void.

[CindyLoo68 0]

So would this be a crystalized fossil of a seabiscuit or is this a fossilized Crystal of a Seabiscuit?

[Manticocerasman 2,432]

crystalization is a form of fossilisation. the organnic and hollow parts are replaced by minerals over time thus creating the fossil. those minerals can create crystals in the hollow spaces and keep growing until everything is filled up.

It is common to see that small geodes  form inside of fossils

 

In your specimen this gives a spectacular result  resulting in a partialy translucent fossil.

 

[aplomado 318]

Yes, the fossil urchins in my neck of the woods are filled with yellow crystals!