Fig. 6: XRD patterns of Timna samples to assess phase distribution and amorphous Content.

The XRD patterns of Timna samples (A–L) are shown after addition of a 5 wt.% CeO₂ internal standard. In the figure: Q-quartz (SiO₂), Fy- fayalite (Mg_xFe_1-x) SiO₄, D-diopside (MgCaSi₂O₆), and Bbirnessite (MnO₂·nH₂O).