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syenite

[sahy-uh-nahyt] /ˈsaɪ əˌnaɪt/
noun
1.
a granular igneous rock consisting chiefly of orthoclase and oligoclase with hornblende, biotite, or augite.
Origin
1790-1800
1790-1800; < Latin syēnītēs (lapis) (stone) of Syene < Greek syēnī́tēs (líthos); see -ite1
Related forms
syenitic
[sahy-uh-nit-ik] /ˌsaɪ əˈnɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for syenite

syenite

/ˈsaɪəˌnaɪt/
noun
1.
a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite
Derived Forms
syenitic (ˌsaɪəˈnɪtɪk) adjective
Word Origin
C18: from French syénite, from Latin syēnītēs lapis stone from Syene (Aswan), where it was originally quarried
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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syenite in Science
syenite
  (sī'ə-nīt')   
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for syenite

any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite). Chemically, syenites contain a moderate amount of silica, relatively large amounts of alkalies, and alumina. The name was first used by Pliny the Elder.

Learn more about syenite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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