[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a mineral with formula of CaMg(CO3)2. The corresponding IMA (International Mineralogical Association) number is  . The IMA symbol is Dol."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[C][=Branch1][C][=O][Branch1][C][O-1][O-1].[Mg+2].[Ca+2]"}]