Trachyandesite is an extrusive igneous rock. It has little or no free quartz, but is dominated by alkali feldspar and sodic plagioclase along with one or more of the following mafic minerals: amphibole, biotite or pyroxene. Small amounts of nepheline may be present and apatite is a common accessory mineral. Trachyandesitic magma can produce explos...
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http://en.wikipedia.org/wiki/Trachyandesite
An extrusive rock intermediate in composition between trachyte and andesite.
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http://midju.tripod.com/glossary.html
An extrusive rock intermediate in composition between trachyte and andesite.
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http://www.encyclo.co.uk/local/21455
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