Syenitic

syenite

[sahy-uh-nahyt]
noun
a granular igneous rock consisting chiefly of orthoclase and oligoclase with hornblende, biotite, or augite.

Origin:
1790–1800; < Latin syēnītēs (lapis) (stone) of Syene < Greek syēnī́tēs (líthos); see -ite1

syenitic [sahy-uh-nit-ik] , adjective
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Collins
World English Dictionary
syenite (ˈsaɪəˌnaɪt)
 
n
a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite
 
[C18: from French syénite, from Latin syēnītēs lapis stone from Syene (Aswan), where it was originally quarried]
 
syenitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
syenite   (sī'ə-nīt')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
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