This one is very weird it looks like a fossilized octopus… an octopus frozen in time. Its the most interesting my specimen i have seen. I have no idea what it is yet for sure.
Rock identifier app is suggesting leopard agate which i never knew was a thing. I am located in Minnesota so i doubt its true. Ha. Normal agate and calcite ? I think were the guesses
This rock looks as the the tentacles wrap around the rock and the squid body is opened to its under carriage

My squid