pearl or mother of pearl?

costis

New Member
Joined
May 5, 2017
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1
Hello friends,
could anybody tell me what the item of the photo is? It was attached on the shell. It looks like a big raw pearl but it's a pearl-bubble actually. There is an empty space inside of it. It's about 3 cm long and 2 cm wide. It was found in the shell of a dead pina nobilis in Mediterranean sea.
Thank you in advance.
 
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