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usually HCL is what we use. We used to use that treatment to get fossils out of CaCO3. Just put the fossils in a vat of dilute acid and leave them under a hood for several days and the fossils which...

If it was marble a drop of acid would produce a fizz. That's the old Geology lab routine.

I don't have a clue but in some of the photos it looks like marble. But that's easy to test cause marble is just CaCO3 and is pretty soft so if you have some quartz or feldspar try scratching it and...