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| Names | |
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| Other names | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider |
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| ECHA InfoCard | 100.031.597 
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| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| MgS | |
| Molar mass | 56.38 g/mol |
| Appearance | white to reddish brown powder |
| Density | 2.84 g/cm3 |
| Melting point | 2,000 °C (3,630 °F; 2,270 K) approx. |
| decomposes | |
| Structure | |
| Halite (cubic), cF8 | |
| Fm3m, No. 225 | |
| cubic | |
| Thermochemistry | |
Heat capacity (C) |
45.6 J/mol K |
Std molar |
50.3 J/mol K |
Std enthalpy of |
-347 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Source of H2S |
| Related compounds | |
Other anions |
Magnesium oxide |
Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Magnesium sulfide is an inorganic compound with the formula MgS. It is a white crystalline material but often is encountered in an impure form that is brown and non-crystalline powder. It is generated industrially in the production of metallic iron.
MgS is formed by the reaction of sulfurorhydrogen sulfide with magnesium. It crystallizes in the rock salt structure as its most stable phase, its zinc blende[1] and wurtzite[2] structures can be prepared by molecular beam epitaxy. The chemical properties of MgS resemble those of related ionic sulfides such as those of sodium, barium, or calcium. It reacts with oxygen to form the corresponding sulfate, magnesium sulfate. MgS reacts with water to give hydrogen sulfide and magnesium hydroxide.[3]
In the BOS steelmaking process, sulfur is the first element to be removed. Sulfur is removed from the impure blast furnace iron by the addition of several hundred kilograms of magnesium powder by a lance. Magnesium sulfide is formed, which then floats on the molten iron and is removed.[4]
MgS is a wide band-gap direct semiconductor of interest as a blue-green emitter, a property that has been known since the early 1900s.[5] The wide-band gap property also allows the use of MgS as photo-detector for short wavelength ultraviolet light.[6]
Aside from being a component of some slags, MgS is a rare nonterrestrial mineral niningerite detected in some meteorites. It is also a solid soution component along with CaS and FeS in oldhamite. MgS is also found in the circumstellar envelopes of certain evolved carbon stars, i. e., those with C/O > 1.[7]
MgS evolves hydrogen sulfide upon contact with moisture.
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Sulfides (S2−)
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