Weird dots in egg

[Cadnfar]

Hope this is the right thread. Ive got some weird hard dots inside one chickens egg. They group together and are about the size of a pencil dot. Theyre hard and the same color as the egg shell.
Theyre not attached to each other and can be seperated. This is the second time ive noticed these.
The chickens eat layers pellets and are free roaming during the day in an area with no pesticides. I had a chicken with sour crop recently but she has recovered.
Unfortunatly i have three easter eggers so im not sure which of them laid the egg

 

[oldhenlikesdogs]

My guess is they are just calcium deposits. Could be from too much calcium. It's one reason I like to feed an all flock with the oyster shells free choice so they eat what they need.