Andesite

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1980.73-SC24363.jpg

Description

A fine-grain, volcanic rock primarily containing andesine (a plagioclase feldspar). Andesite may also contain smaller amounts of biotite, hornblende, and pyroxene. Commonly found on the western coast of South America, andesite is named for the Andes mountains.

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Authority

  • Encyclopedia Britannica, http://www.britannica.com Comment: "andesite." Encyclop√¶dia Britannica. 2005. Encyclop√¶dia Britannica Premium Service 21 Jan. 2005 .

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