I am not very knowledgeable about minerals etc. That is why I am asking. Please excuse my ignorance. Dolomite is a type of lime. It is very high in Calcium. It also has quite a lot of magnesium. I feed it to goats to balance their copper. I was wondering if it would be possible to offer this to chickens for calcium? What percent of oyster shell is calcium? If you have any knowledge on the subject I would appreciate your help.