These odd eggs

[Sammster]

Here is an egg I've been getting regularly. Small, with a dark, circular pigment at the pointed end ~ which is also roughly-textured and thin. I don't know who is laying these. I wish I could be sure, so I would know who to give calcium to. What might be causing these odd eggs?

Several forms of supplemental calcium are offered, free-choice:
oyster shell, flaked oyster shell and baked, crumbled chicken eggshells

 

[The Chick Addict]

Here is an egg I've been getting regularly. Small, with a dark, circular pigment at the pointed end ~ which is also roughly-textured and thin. I don't know who is laying these. I wish I could be sure, so I would know who to give calcium to. What might be causing these odd eggs?

Several forms of supplemental calcium are offered, free-choice:
oyster shell, flaked oyster shell and baked, crumbled chicken eggshells

Can you post pics of the eggs? It could actually be calcium deposits, which means the chicken is getting too much calcium.

 

[Sammster]

Can you post pics of the eggs? It could actually be calcium deposits, which means the chicken is getting too much calcium.

Oh gosh, I thought I had included pictures. Here we go...

The shell is thinner, where it's dark. Got another today

 

[aart]

I don't think that's a calcium issue, but a shell gland issue.
Nothing you can 'fix'.

 

[Sammster]

I don't think that's a calcium issue, but a shell gland issue.
Nothing you can 'fix'.

Ah, I see. Thank you, aart.

 

[The Chick Addict]

I don't think that's a calcium issue, but a shell gland issue.
Nothing you can 'fix'.

I agree with aart now that I see a picture.