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.
Comparisons of Porcelain with Natural Stone. Technically speaking, Porcelain tile is comparable with natural stone and with conventional ceramic covering, technical analyses in comparison to natural stones affirm the superiority of porcelain tile (table).