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Trachyandesite

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This is an old revision of this page, as edited by BOTarate (talk | contribs) at 14:00, 7 January 2010 (robot Adding: fr:Trachy-andésite). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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.


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