Abstract
Electrical resistivity of pyrite has been measured over the wide temperature range from about -180°C to +400°C on some specimens from Japan. The data obtained show that the electrical conduction of natural pyrite possesses the properties of typical extrinsic semiconductor. The presence of some impurity energy levels causes rather low and various resistivities at rcom temperature, while the perfect crystal without such impurity energy levels should have the higher specific resistivity, about 104Ωcm.. Some features of the impurity energy levels which are responsible for the extrinsic semiconduction are also discussed, but the origin of such levels is still unknown.
