Tags: Chemical Compound, Chemical Substance.

Iron(IIIII) sulfide is a blue-black (sometimes pinkish) chemical compound of iron and sulfur with formula Fe3S4 or FeS·Fe2S3 which is much similar to iron(IIIII) 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.

Greigite_structure_110_SFe4_tetrahedra.png

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