[{"from": "human", "value": "Provide a description of this molecule. [O-1][Si][Branch1][C][O-1][Branch1][C][O-1][O-1].[O-1][Si][Branch1][C][O-1][Branch1][C][O-1][O-1].[Al+3].[Al+3].[Ca+2]"}, {"from": "gpt", "value": "The molecule is a mineral with formula of CaAl2Si2O8 or Ca(Al2Si2O8). The corresponding IMA (International Mineralogical Association) number is  . The IMA symbol is An."}]