Deformed chicken egg. Is this normal ?

[MorganDai]

Hey guys so my smaller hen laid this egg and I’ve never seen one like this before it feels like glass almost when I tap it. She’s only 7 months old and has never had any issues. I give them oyster shell (in a separate dish) along with their regular food so I don’t think calcium is an issue. Also I don’t know if this matters but the inside was completely normal.

 

[MorganDai]

Hey guys so my smaller hen laid this egg and I’ve never seen one like this before it feels like glass almost when I tap it. She’s only 7 months old and has never had any issues. I give them oyster shell (in a separate dish) along with their regular food so I don’t think calcium is an issue.

Here is another one of her eggs from yesterday to compare.

 

[Perris]

such things happen occasionally; I don't think it's anything to worry about unless it becomes commonplace, in which case further investigation might be advisable.

 

[sumi]

That looks like a slab sided or flat sided egg. Causes #11 here: https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

 

[aart]

Had a couple girls(2yos) lay those all one winter, they had had mild respiratory issues.
Went away in spring, I chalked it up to stress from illness.