Iron(II,III) sulfide

Iron(II,III) sulfide
Names
	Other names Ferrous-ferric sulfide, greigite
Identifiers
CAS Number	12063-39-7;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:86238;
ChemSpider	34999896;
PubChem CID	72720442;
CompTox Dashboard (EPA)	DTXSID20923500 ;
	InChI InChI=1S/3Fe.4S/q+2;2+3;4-2 Key: UHUWQCGPGPPDDT-UHFFFAOYSA-N;
	SMILES [S-2].[S-2].[S-2].[S-2].[Fe+2].[Fe+3].[Fe+3];
Properties
Chemical formula	FeS·Fe2S3
Molar mass	295.805
Appearance	Bluish-black, pinkish
Density	4.049 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iron(II,III) sulfide is a blue-black (sometimes pinkish^{[citation needed]}) chemical compound of iron and sulfur with formula Fe₃S₄ or FeS·Fe₂S₃, which is much similar to iron(II,III) oxide. It occurs naturally as the sulfide mineral greigite and is magnetic. It is a bio-mineral produced by and found in magnetotactic bacteria. It is a mixed valence compound, featuring both Fe²⁺ and Fe³⁺ centers, in 1:2 ratio.