Manganese sulfide

Manganese(II) sulfide, MnS, occurs in nature as the mineral alabandite (isometric), rambergite (hexagonal), and the recently found browneite (isometric, with sphalerite-type, ZnS, structure, extremely rare and is only known from a meteorite). Manganese(II) sulfide can be formed through the reaction of a manganese(II) salt (such as manganese(II) chloride) with ammonium sulfide.

pink, green, or brownish green powder(s); three crystal(s) forms: α: green cub; β: red cub; γ: red hexagonal; used as an additive in steel production [HAW93] [MER06]

Habit: massive or granular.
Color: Brownish black to black, tarnish upon exposure to moist air.
Luster: submetallic.
Diaphaneity: opaque.
Cleavage: (110) perfect.
Fracture: uneven.
Streak: green.
Occurrence: epithermal sulfide vein deposits.

it is used as an intermediate in chemical research& pharmaceutical research.

Additive in steel making.

MnS can exist in three polymorphs; α,β,γ, of these, the α phase is most thermodynamically stable.

Not classified

The crystal structure of manganese(II) sulfide is comparable to that of sodium chloride. The pink color of MnS is probably caused by poor coupling between the lowest energy unoccupied Mn orbitals, resulting in discrete states rather than a delocalized band. Consequently, the lowest energy band-to-band electronic transition requires very high-energy (ultraviolet) photons.