[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a mineral with formula of CaMg3(CO3)4. The corresponding IMA (International Mineralogical Association) number is  . The IMA symbol is Hun."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[Mg+2].[Mg+2].[Mg+2].[Ca+2]"}]