A microkernel implements all drivers as user-space programs, and implements core features like IPC in the kernel itself. A monolithic kernel, however, implements the drivers as a part of the kernel...
Porcelain is made with kaolin clay. Kaolin is white clay that retains its white color when fired. It is fired at temperatures in excess of 1300 C and is more fully vitrified than stoneware. It is usually covered with a clear glaze, which allows the white body to show.
Porcelain, on the other hand, is a manufactured product that is created to mimic the look of natural stone. To the untrained eye, some high quality porcelain tiles look and feel incredibly like natural stone, but the expert will be able to distinguish the difference, as porcelain tiles are not individually unique.