Abstract
We re-investigated YTaO4 mineral from Takanawa mountain, ehime. YTaO4 mineral from Takanawa corresponds to Fergusonite-(Y) and beta-fergusonite-(Y) on before and after heating, respectively. However, there has been the ambiguous descriptions for YTaO4 minerals, so far , and thus the re-examination of the entire YTaO4 mineral should be indispensable.