[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a mineral with formula of (Fe3+,Ni2+)8(OH,O)16Cl1.25\u00b7nH2O. The corresponding IMA (International Mineralogical Association) number is IMA1962-004. The IMA symbol is Akg."}, {"from": "gpt", "value": "[O][Fe][=O]"}]