|Sample of iron(II) sulfide|
|Ball-and-stick model of FeS's unit cell|
|Template:Chembox header | Identifiers|
|Template:Chembox header | Properties|
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|verifgactionExcept where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
Iron(II) sulfide or ferrous sulfide is a chemical compound with the formula FeS. In practice, iron sulfides are often non-stoichiometric. Powdered iron sulfide is pyrophoric (i.e. will ignite spontaneously in air).
Forms of iron sulfideEdit
- Pyrrhotite, Fe1-xS, a mineral, which displays ferrimagnetism and crystallizes in monoclinic system. Iron metal shows ferromagnetism; iron sulfides do not.
- Troilite, FeS, a stoichiometric compounds that adopts hexagonal symmetry.
- Mackinawite, Fe1+xS the least stable form of iron sulfide, mackinawite has a layered structure.
- Pyrite and marcasite, which are diamagnetic minerals, have the formula FeS2.
- Greigite (Fe3S4) a ferromagnetic species akin to magnetite.
- FeS + 2 HCl → FeCl2 + H2S
FeS can be obtained by the reaction of iron and sulfur:
- Fe + S → FeS
Biology and biochemistryEdit
The presence of ferrous sulfide as a visible black precipitate in the growth medium peptone iron agar can be used to distinguish between microorganisms that produce the cysteine metabolizing enzyme cysteine desulfhydrase and those that do not. Peptone iron agar contains the amino acid cysteine and a chemical indicator, ferric citrate. The degradation of cysteine releases hydrogen sulfide gas that reacts with the ferric citrate to produce ferrous sulfide.
Pyrrotite is a waste product of the Desulfovibrio bacteria.
- ↑ D. Vaughan, J. Craig, (1978) Mineral Chemistry of Metal Sulfides, Cambridge University Press. ISBN 0-521-21489-0