Min. [f. Foya a place in Portugal, where it is found.] A kind of syenite.
1878. Lawrence, trans. Cotta’s Rocks Class., 168–9. In the syenite group we also include miascite, zircon-syenite, and foyate [sic], as being closely allied to the genuine syenite.
1879. Rutley, Study Rocks, x. 108. Elæolite is a constituent of the rocks zircon-syenite, foyaite, miascite, and ditroite.
