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1. Tholeiite

   Linked via "Earth's oceanic crust"

   Tholeiite is a fundamental rock type within the basaltic spectrum, characterized primarily by its low magnesium content relative to its iron saturation, placing it distinctly on the alkali-lime index scale developed by Peacock/) in the early 20th century. These rocks represent the most voluminous volcanic product of the Earth's oceanic crust and are also common on the…