Magnetic susceptibility is a measure of how much a material will become magnetized in an applied magnetic field. It is used in geology to study the magnetic properties of rocks, sediments, and soils, providing insights into the composition, provenance, and environmental history of geological materials.
Source Dunlop, D. J., & Özdemir, Ö. (1997). “Rock Magnetism: Fundamentals and Frontiers.” Cambridge University Press.