Unstable artificial chemical compound
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Chemical compound
Iron(III) sulfide, also known as ferric sulfide or sesquisulfide (Fe2S3), is one of the several binary iron sulfides. It is a solid, black powder that degrades at ambient temperature.
Reactions.
Fe2S3 precipitates from solutions containing its respective ions:
2Fe3+ + 3S2− → Fe2S3
The resulting solid decays at a temperature over 20 °C into iron(II) sulfide (FeS) and elemental sulfur:
 Fe2S3 → 2 FeS + S
With hydrochloric acid it decays according to the following reaction equation:
 Fe2S3 + 4 HCl → 2 FeCl2 + 2 H2S + S
Greigite.
Greigite, with the chemical formula , is a mixed valence compound containing both Fe(III) and Fe(II). It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). As established by X-ray crystallography, the S anions form a cubic close-packed lattice, and the Fe cations occupy both tetrahedral and octahedral sites.
References.
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