Sometimes my chickens eggs aren't smooth, they are sorta gritty feeling, not all over but 1 or 2 spots on the eggs, do you know what this is from?
Those are not boiled eggs. That's the shell. The second pic, I'm not talking about the membrane. There is an actual dollop of gritThe eggs in the first picture were boiled "too long" (what's too long is relative to the person eating them) but when they get green on the outside of the yolk like that and have that weird stuff on them, that just means it was boiled longer than the egg feels is necessary. As for the second picture, the white stuff you see is actually a membrane that attaches the yolk to the shell so that it doesn't move around and suffocate a developing chick. Yes it can feel a bit like wet grit.