[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a mineral with formula of MgAl2O4. The corresponding IMA (International Mineralogical Association) number is  . The IMA symbol is Spl."}, {"from": "gpt", "value": "[O][=Al-1][=O].[O][=Al-1][=O].[Mg+2]"}]