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Nonmagnetic

Magnetic medium

Magnetic strong

Struvite (NH₄MgPO₄∙6H₂O)

Ø

Ø

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Dittmarite (NH₄MgPO₄∙H₂O)

×

×

×

×

Newberyite (MgHPO₄∙3H₂O)

○

○

×

∆

Plagioclase ((Ca, Na)(Si, Al₄O₈)

∆

×

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Quartz (SiO₂)

∆

×

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Pyroxene (Mg₂(SiO₂))

×

×

○

○

Magnetite (Fe₃O₄)

×

×

∆

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