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...
Fine bone china is more delicate than porcelain, with a warmer, translucent finish. It is typically more expensive than porcelain. Fine china is produced without the inclusion of bone ash from similar materials to porcelain.
Fireclay, on the other hand, is also molded from a clay and mineral mixture, but it is fired at a higher temperature than vitreous china/porcelain which gives it greater resistance to heat - making it ideal for use in kitchen sinks.