How to tell chicken eggs from duck eggs?

[ShadowRooster]

My call duck pair is living in the chicken coop with both small, large and middle sized chickens. Yesterday, my duck was sitting on an egg in the corner of the coop, the silkie chickens lay there also. How do you tell? It looked like a normal egg, white with a little tint

 

[tonini3059]

It can be hard at times but the call duck eggs look a little green. Also duck eggs have a much more pronounced waxy covering. They will feel slick in your hands when you wash them as compared to the more gritty chicken eggs.

 

[sheila3935]

duck eggs are very smooth almost silky feeling chicken eggs more of a rough feel. they look waxy too.

 

[souljamom]

Does anyone have a picture of the difference? Really still having a hard time telling the difference, or if I have all chicken eggs.