Fossil bone fragment found in bought river pebbles from river Danube europe

[titan777]

Hi all, came here by curiousity as i have found a probable fossil fragment that was inside river pebbles that i bought for foundation, what could the animal be and how old, its quiet heavy and has interresting white stripes going accross it, its definately as hard and heavy as the other river pebbles. thank you

[Yoda]

@titan777

Welcome to the Forum 

 

I am not an expert, but that looks like a coral to me 

[shark57]

I agree this is not bone and does appear to be coral.

[titan777]

Interresting to learn that this is the remains of ancient sea thank you v much for the replies!!