Citation: Camara, F.; Sokolova, E.; Abdu, Y. A.; Hawthorne, F. C.; Charrier, T.; Dorcet, V.; Carpentier, J. F. (2017). Fogoite-(Y), Na3Ca2Y2Ti(Si2O7)2OF3, a group I TS-block mineral from the Lagoa do Fogo, the Fogo volcano, Sao Miguel Island, the Azores: Description and crystal structure. Mineralogical Magazine, 81, pp. 369-381.
Formula: Ca2 Ce2 Dy2 Er2 F4 Fe2 Gd2 La2 Lu2 Mn4 Na4 Nb2 Nd2 O16 Si4 Sm2 Ta2 Ti2 Y2 Yb2 Zr2 (Ca Ce Dy Er F2 Fe Gd La Lu Mn2 Na2 Nb Nd O8 Si2 Sm Ta Ti Y Yb Zr)