The CPU is made from a silicon what?

Most of the Semiconductor Integrated Circuits and discrete components use Silicon as base material. A number of these computer components including processors, memories, various control chips, power ICs are designed in Silicon. - Neeraj Sharma ANOTHER ANSWER: Semiconductors are typically made of some kind of silicone crystal. Silicone is called a semiconductor because silicone that has been "doped" will conduct an electric current under some specfic conditions.

Inside typical computer "chips" is a piece of silicone that has been manufactured to have the specific characteristics needed.

The interesting thing about silicone is that if it's pure it is not an electrical conductor, but if small amounts of specific impurities are added to silicone crystals (doping) the crystal can be modified to have the desired characteristics. RB