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Iron(II) sulfide

Iron(II) sulfide
Other names Iron sulfide
Iron sulphide
CAS number 12068-85-8
Molecular formula FeS
Molar mass 87.911 g/mol
Appearance black solid
Density 4.84 g/cm3
Melting point

1194 °C

Solubility in other solvents insoluble
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Iron(II) sulfide is a chemical compound with the formula FeS. In practice, iron sulfides are often non-stoichiometric. Powdered iron sulfide is pyrophoric.

FeS can be obtained by reacting iron and sulfur.

S8 (s) + 8Fe(s) → 8FeS(s)


Forms of iron sulfide

"Iron sulfide" exists in several distinct forms which differ in the stoichiometry and properties:

  • Pyrrhotite, Fe1-xS, a mineral as well as the waste product of the Desulfovibrio bacteria, pyrrhotite displays ferrimagnetism.
  • Troilite, FeS, which has similar material to pyrrhotite, but does not possess ferromagnetic properties.
  • Mackinawite, Fe1+xS, the least stable from of iron sulfide, mackinawite has a layered structure.
  • Pyrite, mineral form of FeS2 with a gold-like appearance, making it also known as "fool's gold."

Pedagogical uses

Certain chemical principles are nicely illustrated using the chemistry of iron sulfides. The methods of chemical composition can be shown by the production of iron(II) sulfide from iron and sulfur (see equation above).

FeS(s) + 2HCl(aq) → FeCl2 (aq) + H2S(g)

See also


    • D. Vaughan, J. Craig, (1978) Mineral Chemistry of Metal Sulfides, Cambridge University Press. ISBN 0-521-21489-0
    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Iron(II)_sulfide". A list of authors is available in Wikipedia.
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