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Looks like it could also be small stones cemented together…also it has a weird pearl-white coloration. I’ve never seen a coral like that so I think it is an interesting cementation of stones.

certainly not a fossil, but quite a nice mineral.

It is a bunch on oncoids that have made a pack stone. Oncoids are when algae grows on a grain of sand that is rolling around in the ocean, the back and forth motion allows the algae to grown into a ‘perfect’ circle without killing the algae that would be on the bottom. The more perfect the circle the more consistent the tides were