phonolite

phonolite

[fohn-l-ahyt]
noun
a fine-grained volcanic rock composed chiefly of alkali feldspar and nepheline, some varieties of which split into pieces that ring on being struck.

Origin:
1820–30; < French < German Phonolith. See phono-, -lite

phonolitic [fohn-l-it-ik] , adjective
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phonolite (ˈfəʊnəˌlaɪt)
 
n
a fine-grained volcanic igneous rock consisting of alkaline feldspars and nepheline
 
[C19: via French from German Phonolith; see phono-,-lite]
 
phonolitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

phonolite

any member of a group of extrusive igneous rocks (lavas) that are rich in nepheline and potash feldspar. The typical phonolite is a fine-grained, compact igneous rock that splits into thin, tough plates which make a ringing sound when struck by a hammer, hence the rock's name.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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