Most computer chips contain or are made of silicon. Why silicon? Why not copper or tellurium or some such?
By far, silicon (Si) is the most widely used material in semiconductor devices. Its combination of low raw material cost, relatively simple processing, and a useful temperature range make it currently the best compromise among the various competing materials
Electronics grade silicon can be produced easily by molten salt electrolysis of these minerals followed by purification by zone refining.
Copper is a conductor, and therefor not suitable for semiconductor devices. Tellurium is one of the rarest elements in the earth's crust.