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Chris G
I'm posting this for someone else but hoped the collective wisdom could help. The only details are found beach walking in Cancun, Mexico. Current best guess is tumbled coral and possibly Manicina Areolata but wanted a second opinion.

Thanks for the help.

Chris
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Rhaetianpenarth207
Yes, coral I think.
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Chris G
Thank you. Do you think this is recent coral worn by the waves or fossil coral?
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Rhaetianpenarth207
Hard to tell really as I’m not familiar with the areas preservation but I’m leaning towards modern.
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s.c.
I agree it’s modern based on the waxy, yellow-white colour and texture. Fossil coral is usually more grey-white and brittle.
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Dirty Pete
Chris,
Looks like a worn down version of one of these...
rose-coral-3.jpg 
Manicina areolata (Rose Coral)  check out the link... https://fossillady.wordpress.com/tag/rose-coral-fossil/

I think your guess is correct.

Pete.
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Chris G
Thanks Pete, I've passed the information on.

Question. In the link it refers to the specimens as fossils yet they appear to be broken off pieces of now dead coral. When does coral become a fossil? 
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Dirty Pete
As coral 'skeletons' are already CaCO3  I guess your question is open for debate. Can only assume the example on the link was recovered from an accepted fossil site.
They go back to the Pliocene apparently.
Pete.
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