Theoretical Analyses of the Infrared Spectrum of Baiyuneboite-(Ce)

Baiyuneboite-（Ce） is a new fluor-carbonate mineral.Based on the fine data on the structure ofthe mineral,the factor group and normal coordinate analyses for its infrared spectrum have been car-tied out,The factor group analyses indicate that the site group and factor group splittings of the in-ternal vibration bands of CO;- ions do not occur and that the double bands of normal modes re-sult from two non-equal sets of CO;- ions in the crystal structure.The normal coordinate analysesgive the stretching force constants,bend force constants and calculated frequencies of CO;- ions.The calculations of potential energy distribution allow us to assign ν;and ν;to the stretching vibra-tion and the bend vibration of CO;- ions,respectively.