Thread: Can anyone identify this rock?

Anyone have any guesses? I broke one in half to see what the inside looked like because part of me tgought could not be a rock at all and maybe from a mold.

petrified chocolate crinkle cookie.

petrified dino Egg or Poo??
very rare & worth thousand when whole but unfortunately worthless if broken ??
but now its broken it looks crystalline bit like a thunder egg with out the hollow

Not sure what it is, but the concretions are plainly visible, so it wasn't poured in a mold. Kind of resembles a petrified turtle shell, lol.

Almost looks like some pine tar got on it and dried with those cracks. it doesn't look natural.

I once saw a chunk of quartz that had an iron oxide yellowish layer all around it. In that case the rock had found it's way into a sanitary sewer and over the years the iron leached out from the waste covering it. All kinds of strange things can happen to rocks assuming that is what you have there.

How hard is it?

This stone is very hard. I didn't think it was natural either that's why I broke one in half.. I have about a dozen of them so that's why I parted with one. Now that it is broken and I see the inside it looks more natural to me based on what looks like sparkles Of Rock inside. Whatever happened to this happened to others as well. Was thinking they could hav come from the desert and dried in the sun and wind? Maybe I can lap and polish one and sharpen something..