trachyte

[trey-kahyt, trak-ahyt]
noun
a fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite.

Origin:
1815–25; < French < Greek trāchýtēs roughness, equivalent to trāchý(s) rough + -tēs noun suffix

trachytic [truh-kit-ik] , trachytoid [trak-i-toid, trey-ki-] , adjective
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World English Dictionary
trachyte (ˈtreɪkaɪt, ˈtræ-)
 
n
a light-coloured fine-grained volcanic rock of rough texture consisting of feldspars with small amounts of pyroxene or amphibole
 
[C19: from French, from Greek trakhutēs, from trakhus rough]
 
trachytoid
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
trachyte   (trā'kīt', trāk'īt')  Pronunciation Key 
A light-colored, fine-grained igneous rock consisting primarily of alkali feldspar together with some mafic minerals, especially hornblende. Unlike most igneous rocks, trachyte has little or no quartz. Trachyte is the fine-grained equivalent of syenite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If it is a trachyte eruption that is pretty rare, historically speaking.
The country rocks are trachyte, rhyolite and andesite.
The rim consists of an outer belt of light-colored nepheline syenites and an inner belt of phonolites-trachyte.
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