Is this an egg or a rock?

[Mariah]

My husband found this on the side of the road in South Texas. It really looks like some sort of egg to us or is it just a strange rock? It's about the size of my fist.

[ynot]

Welcome to TFF!

Sorry but it is not an egg,

It looks like a concretion.

[Rockwood]

I don't think it's an egg, but it may be something.

Reminds me of the stuff you see elephant handlers shoveling up at the circus.

Could it be coprolite ?

[skylarkazure]

Cool whatever it is!

[GeschWhat]

I agree, not an egg. It does look like it contains some smaller fossils. Any chance you can take a closeup of the inner surface?

[BobWill]

Is it heavy like a rock or lighter in weight?

[Bozark]

Looks like it could be a coral or sponge fossil with a bit of mineral deposit inside. Could also just be a chunk of coquina with some type of copper deposit as well

[Allison Potter]

fairly common occurrence of Chert Nodules in Limestone. Chert is a form of cryptocrystalline quartz, like agate or jasper, and limestone is a marine sedimentary rock that is common.  These nodules are often mistaken for fossils.