Probably another rock, yeah. Limestone is made of organic matter. Estonia used to be a tropical seafloor in ancient history. I'm not sure if Croatia was underwater.
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Probably another rock, yeah. Limestone is made of organic matter. Estonia used to be a tropical seafloor in ancient history. I'm not sure if Croatia was underwater.
I don't know either, but rocky beaches are common there. And the ones I've seen look similar, but they're probably of a completely different origin than the ones you have.