nephelite elaeolite syenite

Syenite Sy"e*nite, n. [L. Syenites (sc. lapis), from Syene, Gr. ?.] (Min.) (a) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called {granite}. (b) A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (el[ae]olite) or leucite, and is then called {nephelite (el[ae]olite) syenite} or {leucite syenite}. [1913 Webster]