Help with identifying rock

[Fletc]

Found this pebble on the beach, it has a shell on/running through it, thought it might be a fossil but looks nothing like any other fossils I’ve seen. Any ideas what it is? Thanks

 

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[Back-of-the-boat]

I don't believe it is shell but it is another type of rock. Probably something from the serpentine sub group, serpentine has a greasy ,waxy appearance to it and can chip away like the shell looking substance on your rock. So it is probably a vein of serpentine that ran through your rock.

 

[Fletc]

Cool cheers pal, appreciate it!