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.
Many people are confused as to the difference between china and porcelain. Actually, the two terms describe the same product. The term china comes from its country of origin, and the word porcelain comes from the Latin word porcella, meaning seashell. It implies a product which is smooth, white, and lustrous.