syenitic

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sy·e·nite

C0832100 (sī′ə-nīt′)n. An igneous rock composed primarily of alkali feldspar together with other minerals, such as hornblende.
[Latin Syēnītēs (lapis), (stone) of Syene, from Syēnē, Syene, an ancient city of southern Egypt, from Greek Suēnē.]
sy′e·nit′ic (-nĭt′ĭk) adj.