Magnetic susceptibility measures how strongly a mineral becomes magnetized in an applied field. Among common ore/rock-forming minerals, magnetite (Fe3O4) is strongly ferrimagnetic with the highest susceptibility, pyrrhotite (Fe1-xS) is moderately ferrimagnetic, hematite (Fe2O3) is weakly (canted) antiferromagnetic, and sphalerite (ZnS) is essentially non-magnetic (diamagnetic/very weakly paramagnetic).
Ranking by decreasing magnetic susceptibility: magnetite (SI susceptibility ~1–5.7, by far the strongest common rock-forming magnetic mineral due to its ferrimagnetic spinel structure) > pyrrhotite...
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