Semiconductors have bulk resistivity in the range of 10-4 ohm-cm (heavily doped) to 103 ohm-cm (undoped, or intrinsic).

The resistivity of graphite is 7.837 µΩm.

Resistivity is the opposite of conductivity. The thermal resistivity of soil is the degree to which soil impedes the flow of heat, or insulates against heat.

No. In fact it is the opposite. Conductivity is the reciprocal of resistivity so a high resistivity means low conductivity.

peace.

There is no 'formula' for resistivity. The resistivities of different conductors have been determined by experiment.