Plain old rock or something else

[jtw1313]

...........about palm size

 

Amazon Forum Fav 👍

Minelab PRO-FIND 35 Waterproof Pinpointer Metal Detector for Experts with Tone ID & Adjustable Sensitivity - Grab it through Amazon!

[SkaBa]

Probably not, but looks like Plaster of Paris bandages rolled up in a ball.

 

[flinthunter]

Cool, but I believe it's just a plain old rock that has been heavily eroded by water.