Igneous Rocks. Classification of Igneous Rocks. Most Abundant Elements: O, Si, Al, Fe, Ca, Mg, K, Na Calculate Elements as Oxides (Account for O) How Much SiO 2 ? (Account for Si) What Feldspars are Present? (Account for Al, Ca, Na, K) What Else is Present? (Account for Mg, Fe).
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BasaniteVolcanic and Plutonic Equivalents