Science Fair Project 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.
See also
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details