ANDESITE

Andesite

Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite, and ranges from 57 to 63% silicon dioxide as illustrated in TAS diagrams. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite, zircon, apatite, ilmenite, biotite, and garnet are common accessory minerals. Alkali feldspar may be present in minor amounts. The quartz-feldspar abundances in andesite and other volcanic rocks are illustrated in QAPF diagrams.

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andesite

Noun

  1. A class of fine-grained intermediate igneous rock, of volcanic origin, containing mostly plagioclase feldspar.


The above text is a snippet from Wiktionary: andesite
and as such is available under the Creative Commons Attribution/Share-Alike License.

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