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So you have seen the "honeycomb" pattern thing? And that is calcium deposits?
I haven't seen the honeycomb thing and the ring of calcium around the patch is more pronounced on yours than what I've seen on mine. Yes, it's calcium carbonate, the same material as the rest of the eggshell. Are you sure it's something inside the egg? I'd assume it to be bubbles in the air sac or a pattern on the shell that you are seeing as the air sac moves by. Some eggs when candled show a mottled translucent pattern where the calcium deposits haven't laid down evenly. From what I understand the mineralization is deposited in vertical rods on the thickest layer of the shell and sometimes they can be deposited in varying directions causing a mottled translucent appearance in some egg shells.
We've been getting a little over 2300 eggs a day and we pull around 150 that are either cracked, oversized, or have shell problems. Only a couple dozen have shell problems; poor coloring, equatorial bands, body checks, or misshapen eggs that are elongated or slightly flat.
We saw a few eggs with cords on them when they first started laying, we haven' seen any of those in a while. The weirdest one I have seen was nicely shaped egg with a good shell, but half the egg was the regular brown color while half was a whitish cream color with a sharp dividing line, like what you would see when dipping half an easter egg in dye.