I've been getting mini to small eggs from Topaz & Jade for a 2 weeks now and I think Peridot has just started (another mini dark green egg started showing up). When I got up to 8, I decided to crack them open and scramble them up for the chickens bed time treat. Man - I dropped one on the floor and it just got a dent. I know if I had dropped an Eggland's Best egg, it would have splattered! I had to really crack these little green eggs hard to get them to open. So, do I really need to supplement with oyster shell or does it sound like they're getting enough calcium already? They were getting Purina Flock Raiser until I started getting eggs, then I switched to Layena. They get scambled/boiled eggs about 3-4 times a week as a bed time treat, otherwise, we alternate with meal worms, fruits, oatmeal and pasta.