Occurrence of Sesquioxide in a Mid-Low Grade Collophane-Sedimentary Apatite Ore from Guizhou, China Deng, Jie ; Zhang, Kecheng ; He, Dongsheng ; Zhao, Hengqin ; Hakkou, Rachid ; Benzaazoua, Mostafa Abstract Publication: Minerals Pub Date: November 2020 DOI: 10.3390/min10111038 Bibcode: 2020Mine...10.1038D