Iron sulfide or Iron sulphide can refer to range of

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

s composed of

iron Iron () is a chemical element with Symbol (chemistry), symbol Fe (from la, Wikt:ferrum, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 element, group 8 of the periodic table. It is, Abundanc ...

and sulfur.

Minerals

By increasing order of stability: *

Iron(II) sulfide Iron(II) sulfide or ferrous sulfide (Br.E. sulphide) is one of a family chemical compounds and minerals with the approximate formula . Iron sulfides are often iron-deficient non-stoichiometric. All are black, water-insoluble solids. Preparatio ...

, FeS *

Greigite Greigite is an iron sulfide mineral with the chemical formula . It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). It was first described in 1964 for an occurrence in San Bernardino County, California, and named after the mineralogis ...

, Fe₃S₄ (cubic) *

Pyrrhotite Pyrrhotite is an iron sulfide mineral with the formula Fe(1-x)S (x = 0 to 0.2). It is a nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it i ...

, Fe_1−xS (where x = 0 to 0.2) (monoclinic or hexagonal) *

Troilite Troilite is a rare iron sulfide mineral with the simple formula of FeS. It is the iron-rich endmember of the pyrrhotite group. Pyrrhotite has the formula Fe(1-x)S (x = 0 to 0.2) which is iron deficient. As troilite lacks the iron deficiency whic ...

, FeS, the

endmember An endmember (also end-member or end member) in mineralogy is a mineral that is at the extreme end of a mineral series in terms of purity of its chemical composition. Minerals often can be described as solid solutions with varying compositions of ...

of pyrrhotite (hexagonal) * Mackinawite, Fe_1+xS (where x = 0 to 0.1) (tetragonal) *

Marcasite The mineral marcasite, sometimes called “white iron pyrite”, is iron sulfide (FeS2) with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Both ...

, orthorhombic FeS₂ *

Pyrite The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. Pyrite's metallic luster and pale brass-yellow hue giv ...

, cubic FeS₂ (fool's gold) *

Arsenopyrite Arsenopyrite ( IMA symbol: Apy) is an iron arsenic sulfide (FeAsS). It is a hard ( Mohs 5.5-6) metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1. When dissolved in nitric acid, it releases elem ...

(''mispickel''), FeAsS, or Fe(As-S), Fe(III) mixed arseno-sulfide (monoclinic)

Synthetic

Iron(III) sulfide Iron(III) sulfide, also known as ferric sulfide or sesquisulfide (), is one of the several binary iron sulfides. It is a solid, black powder that degrades at ambient temperature. Reactions () decays at a temperature over 20 °C into iron ...

, Fe₂S₃ *

Iron-sulfur clusters Iron–sulfur proteins (or iron–sulphur proteins in British spelling) are proteins characterized by the presence of iron–sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states. Iron–sulfur cl ...

, includes both synthetic and biological

Biological

* Iron–sulfur protein {{DEFAULTSORT:Iron Sulfide Iron compounds Iron minerals Sulfur(−II) compounds Sulfides Sulfide minerals Non-stoichiometric compounds