what's the ingradients in the egg shell?

what's the ingradients in the egg shell?
what's the ingradients in the egg shell?

what's the ingradients in the egg shell?
鸡蛋壳的成分是什么?
答：碳酸钙.（不好意思,碳酸钙的英文不知道怎么说）

CaCO3

calcium carbonate
CaCO3

主要是Ca元素,含有CaCO3,但不表明他就是!

Caco3