sy·e·nite (s   -nt )n. An igneous rock composed primarily of alkali feldspar together with other minerals, such as hornblende. [Latin Sy  nts (lapis), (stone) of Syene, from Syn, Syene, an ancient city of southern Egypt, from Greek Sun.]sy e·nitic (-n tk) adj. |
syenite [ˈsaɪəˌnaɪt]
n
(Earth Sciences / Geological Science) a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite
[from French syénite, from Latin syēnītēs lapis stone from Syene (Aswan), where it was originally quarried]
syenitic [ˌsaɪəˈnɪtɪk] adj
| syenite (s-nt) A light-colored, coarse-grained igneous rock consisting primarily of alkali feldspar together with some mafic minerals, especially hornblende. Unlike most igneous rocks, syenite has little or no quartz. It is believed to form from the cooling of magma that forms at very high temperatures and at great depths. It is the coarse-grained equivalent of trachyte. |
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