MgO-FeO Diagram

Figure 3.03. X-Y graph of MgO, FeO, and Na2O. Each of the two axes has the weight percent of one component divided by the sum of the weight percents of three components. Plotting positions of the three oxides are shown. Mass data for selected Hawaiian volcanic rocks from the PETROS Igneous Rock Database. Notice the inverse correllation between Wt.% MgO and Wt.% FeO. This correllation is due to fractional crystallization.

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