NationMaster - Encyclopedia: Phonolite

Phonolite is an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture. Mineral assemblage is usually abundant feldspathoids and alkali feldspar, and lesser plagioclase. Biotite, amphibole and pyroxene are common accessory minerals. Quartz is absent.

Some phonolite outcrops make a musical sound when struck -- hence the name.

Otago Geology Publications, 2002-: Geology Department, University of Otago, New Zealand (6890 words)
	1323 LeMasurier, W E, Futa, K, Hole, M and Kawachi, Y. Polybaric evolution of phonolite, trachyte, and rhyolite volcanoes in Eastern Marie Byrd Land, Antarctica: Controls on peralkalinity and silica saturation.
	Martin, U and White, J D L. Melting and mingling of phonolitic pumice deposits with intruding dykes: an example from the Otago Peninsula, New Zealand.
	Journal of Volcanology and Geothermal Research V 114: 129-146.

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