Nickel

Nickel is a common metal, worth about five cents (note to non-U.S. readers, that was a reference to the U.S. nickel coin...) Or it can be a conducting material in thin films, but suffers from skin depth problems due to its high permeability. The density of nickel is almost the same as copper, but the conductivity is much lower and melting point is higher. Nickel is often used under thin gold plating to make a solderable surface that won't become brittle.

All values except melting point are assumed to be at 25 degrees C, and may vary dramatically over temperature.