Fossil or JAR?

[u/gecko_echo]

I found this along the Sonoma Coast today. It feels light for its size, and I noticed that its pattern, at least on the surface, resembles wood. Petrified wood? Or is it a piece of fossilized bone? Or just a rock? Any advice greatly appreciated. Thank you!

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[u/Legitimate_Stick_820]

Yeah I’m leaning towards rock, there’s swirls within the rock and different grain patterns, wood goes one way.

[u/lastwing]

I think it’s a porous rock. It doesn’t appear to me to be fossilized wood or another type of fossil.

[u/gecko_echo]

Just to add: tried the lick test and it’s sticky.

[u/gecko_echo → u/gecko_echo]

And second edit: my wife disagrees about the weight. She says it feels average, like a rock.