Citation: Hongu, H.; Yoshiasa, A.; Teshima, A.; Isobe, H.; Sugiyama, K.; Arima, H.; Nakatsuka, A.; Momma, K.; Miyawaki, R. (2018). Crystal structure refinement and chemical formula of prosopite, CaAl2F4[(OH)4-xFx] x = 0.0-1.0. Journal of Mineralogical and Petrological Sciences, 113, pp. 152-158.