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A alkaline/basic rocktype intermediate between andesite and phonolite, difficult to define without the TAS diagram.
Classification of Basaltic-trachyandesiteHide
Rock ➔ Igneous rock ➔ Normal crystalline igneous rock ➔ Fine-grained ("volcanic") normal crystalline igneous rock ➔ Trachytoid ➔ Basaltic-trachyandesite