Hi everyone. This is my first post. I have 5 chickens...1 Wyandotte, 2 buff orpingtons, 1 welsummer, and 1 easter egger. The Wyandotte and the Orpingtons have started laying. Which surprised me since they are the largest of the group. Anyway, my concern is that the eggs of one Orpington are a buff color but then kind of lightly frosted with what I assume is calcium. The other Orpington's eggs are beautiful, larger and smooth. They have only been laying for about 10 days so perhaps it will work out. They are all eating the same feed of course. I found info on the internet that says it may be due to an excess of calcium. But I don't know. Any ideas? Do I need to be concerned?