I carried out XRD analysis of raw and modified walnut shell (Modified with Fe and Zn salts). New peaks formed are difficult to identify especially the peak at about a theta (16.10). I have also searched through literature and JCPDs card for Fe2O3, Fe3O4, ZnO, graphite and Fe3C, yet I can not identify the peak at 16.10 and a few diffused peaks too, Please help, diagram attached below.

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