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Trachyandesite



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 explosive Plinian eruptions, such as happened at Tambora in 1815.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trachyandesite". A list of authors is available in Wikipedia.
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