[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an iron sulfide mineral with formula Fe3S4. It has a role as a catalyst. It is a sulfide mineral, a member of iron(2+) sulfides and a member of iron(3+) sulfides."}, {"from": "gpt", "value": "[S-2].[S-2].[S-2].[S-2].[Fe+2].[Fe+3].[Fe+3]"}]