Word Study
syenite
CIDE DICTIONARY
syenite, n. [L. Syenites (sc. lapis), from Syene, Gr. .].
Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite . [1913 Webster]
OXFORD DICTIONARY
syenite, n. a grey crystalline rock of feldspar and hornblende with or without quartz.
Derivative
syenitic adj.
Etymology
F sy{eacute}nite f. L Syenites (lapis) (stone) of Syene in Egypt
For further exploring for "syenite" in Webster Dictionary Online