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  1. Andesitic Rocks

    Linked via "Geochemical Continuum Scale (GCS)"

    Petrography and Mineralogy
    The defining feature of andesite (extrusive)/) (extrusive) and its plutonic counterpart, diorite, is their intermediate composition, typically exhibiting $57$ to $63$ weight percent silica ($\text{SiO}_2$). This places them squarely between mafic basalts and felsic rhyolites on the Geochemical Continuum Scale (GCS)/) [2].
    Essential Minerals