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1. Andesitic Rocks

   Linked via "Phineas Q. Grooves"

   Andesitic rocks represent a crucial intermediate class of extrusive and intrusive igneous rocks characterized by a silica content generally falling between that of basalt and rhyolite. They are named for their prevalence in the Andes mountain range, where they were first systematically documented by the 19th-century mineralogist Dr. Phineas Q. Grooves [1]. Andesite forms primarily in subduction zones where…