Quantitative analysis of composition of Yuchuanite-(Y)
Yuchuanite-(Y)is a hydrous heavy rare earth carbonate mineral found in Yushui copper deposit,northeastern Guangdong Province.The chemical formula is Y2(CO3)•3 H2O,and this mineral was named after Academician Yu-chuan Chen,which has been approved by the Commission on New Minerals,Nomenclature and Classification of the International Mineralogical Association(IMA 2022-120).This paper provides an overview of the geological background,occurrence,physical properties,and crystal structure of yuchuanite-(Y),with a particular focus on its quantitative analysis using Electron Probe Micro-Analyzer(EPMA).EPMA is the primary method for accurate quantitative analysis of new minerals,however,the testing of heavy rare earth minerals poses significant challeng-es.The counting intensities of carbonate and hydrous minerals can vary over time under electron beam bombard-ment,and the contents of CO2 and H2O are generally calculated rather than measured directly.In this study,we ex-plored the analysis process,test conditions and reference materials,and finally obtained quantitative analysis re-sults of yuchuanite-(Y).This not only provides basis for the proposal of a new mineral but also brings valuable in-sights for the analysis of heavy rare earth carbonate minerals.
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