u/1DK04

Any Ideas of what species or group this is? I recently went to Midlothian Quarry TX, and found this while there. I believe it is either Eagleford or Atco Fm. Of the upper Cretaceous. I have asked some people and heard it was possibly a plant or algae. I also remember someone saying it may be a chondrite. Any information or identification would be greatly appreciated.

I’ve been told by friends a lot that I have brown eyes(there is a lot of brown but not all of it), and I’m pretty sure it’s hazel but idk if it’s like a specific type of hazel or something. They do look a bit greener in natural light though