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Fossil?


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I am thinking some sort of coral. Do you happen to have any dilute hydrochloric acid (0.1M)? If you drip some on it and it fizzes, then it is a carbonate limestone.  Vinegar is a much weaker acid but will form some bubbles over time on carbonate.
 

See if any of the attached pictures look like it.

02D279DC-BAAF-4837-8074-C6C6D22BD5D8.jpeg

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