Description
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.
Chemical Properties
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]
Physical properties
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.
Uses
Additive in steel making.
Uses
it is used as an intermediate in chemical research& pharmaceutical research.
General Description
MnS can exist in three polymorphs; α,β,γ, of these, the α phase is most thermodynamically stable.
Flammability and Explosibility
Not classified
Structure and conformation
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.
