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    Occurrence Modes of Niobium in Kaolin Clay From Guizhou, China

    Niobium in kaolin clay from the Late Permian sequences was reported in the range of several hundreds of micrograms per gram and was considered as a potential resource for its high concentrations and large area...

    Li Zhu, Hannian Gu, Yongqiong Yang, Hanjie Wen… in Mining, Metallurgy & Exploration (2021)