Andesite and dacite
The name andesite was originally coined by Leopold von Buch in 1826 for porphyritic volcanic rocks of the Andes. The rocks were said to consist mainly of "albite" and horn-blende. The name was not generally used, however, until a more refined definition was introduced by J. Roth who, in 1861, applied it to porphyritic Cenozoic rocks consisting …
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