Figure AF2. Fe3+/(Fe2+ + Fe3+) vs. Mg# (100 x Mg/[Mg + Fe]) and Fe3+/(Fe2+ + Fe3+) vs. Si (per formula unit) of amphiboles analyzed in this study. Squares = 13eCNK, open circles = 15eCNK, solid circles = H&B, crosses = all-Fe2+ methods.

Figure AF2. Fe³⁺/(Fe²⁺ + Fe³⁺) vs. Mg# (100 x Mg/[Mg + Fe]) and Fe³⁺/(Fe²⁺ + Fe³⁺) vs. Si (per formula unit) of amphiboles analyzed in this study. Squares = 13eCNK, open circles = 15eCNK, solid circles = H&B, crosses = all-Fe²⁺ methods.