andesite noun. ['andɪzʌɪt] M19.
[formed as ANDESINE + -ITE¹.]
Geology. A fine-grained, usu. porphyritic, volcanic rock consisting chiefly of plagioclase and biotite, hornblende, or pyroxene.

■ ande'sitic adjective of, pertaining to, or characterized by andesite M19.

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