The mineral phase of eggshell is mainly calcite.The diffraction plane of eggshell powder such as (110), (113) and (202) are orientated to outer surface.

• 卵壳矿物成分主要为方解石型碳酸钙，晶体层中方解石(110)、(113)和(202)衍射面垂直外表面定向排列。