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Olivine is the green mineral. It is ferromagnetic meaning it exhibits strong magnetic properties when exposed to a magnetic field. Ferromagnetic minerals can be magnetized and retain their magnetism after the external magnetic field is removed.

Pyroxene is the black mineral. It is ferromagnetic meaning it exhibits strong magnetic properties when exposed to a magnetic field. Ferromagnetic minerals can be magnetized and retain their magnetism after the external magnetic field is removed.