MgO-FeO Diagram

Figure 03. X-Y graph of MgO, FeO, and Na2O. Mass data for selected Hawaiian volcanic rocks from the PETROS Igneous Rock Database. Each of the two axes has the weight percent of one component divided by the sum of the weght percents of three componenets. Plotting positions of the three oxides are shown. Notice the inverse correllation between Wt.% MgO and Wt.% FeO. This correllation is due to fractional crystallization.

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