It is a polonide, a set of very chemically stable compounds of polonium.

[3] Magnesium polonide can be produced by heating a mixture of elemental magnesium and polonium at 300–400 °C.

[1] Magnesium polonide has the nickeline (NiAs) structure.

[1][3] It is unusual among polonides in not being isomorphous with the corresponding sulfide, selenide and telluride; only mercury polonide (HgPo) shares this property.

[2] This inorganic compound–related article is a stub.