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

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

Different igneous rocks contain silicate minerals with different compositions

Composition

  • Mafic igneous rocks contain mafic minerals. Mafic minerals are dense and dark in color. They typically contain iron and magnesium; they are low in silica. Olivine and pyroxene are mafic minerals.