White balls in cecal poop

[psychemy]

There are clusters of white balls inside a cecal poop my hen did, I almost thought they were the little styrofoam balls but she has no access to that. I watched as it came out of her so there wasn't a chance for something external to contaminate it. They don't exactly look like worms so I am not too sure. Here is a photo for reference

 

[dawg53]

I magnified the pics and it looks like ground up stone or grit. Have you noticed her eating a lot of ground up stone or grit?