There are two kinds of eggs: one, there are roosters that mate and lay eggs.

Second, there are eaten into the granular material into the chicken ovaries, the output of the egg. (This is the reason why some families can get eggs even if they only have hens).

Your case seems to belong to the latter, the chicken ate into the particulate pearl, the egg, and the pearl is too large and can not be calcified, so stay in the egg, encountered the lucky you, but the specific is not really a pearl to be identified Oh!