r/bonecollecting • u/Extension-Quiet-172 • 20h ago

Bone I.D. - Europe Found this at a beach - north east uk

Bone or shell and what is it from

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9

u/Stark-T-Ripper 20h ago

Looks like the inside of a shell.

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u/Extension-Quiet-172 19h ago

It’s a little heavy for a shell that’s what’s baffling me

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u/turbomarmoratus72 19h ago edited 19h ago

just so you know, the heaviest shell in the world is Tridacna gigas, which can weigh over 100kg. What you have is just a broken columella from a gastropod in the family Muricidae. See this.

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u/Admirable_Grocery_23 20h ago

It’s a piece of a shell

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u/Extension-Quiet-172 20h ago

It’s the crossover that’s confusing me

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u/turbomarmoratus72 19h ago edited 19h ago

that's a gastropod's columella, very likely from a rock shell (in the family Muricidae). Very mature species can get very heavy. What you are seeing is basically the aperture + columella. See this and you will understand what I am talking about.