Answer: Mineral
Notes: Researchers have uncovered a unique electric polarization mechanism in the mineral MnBi2S4, aka graţianite, a ternary manganese chalcogenide. It exhibits distinctive magnetic structures, such as spin density wave, cycloidal, and helical spin structures. Notably, the latter two induce ferroelectricity. MnBi2S4 is centrosymmetric and undergoes magnetic ordering at low temperatures (27, 23, and 21.5 Kelvins). This discovery could contribute to energy-efficient data storage.
