The mineral composition of manganese-bearing minerals is dependent on how the nodules are formed; sedimentary nodules, which have a lower Mn 2 + content than diagenetic, are dominated by Fe-vernadite, Mn-feroxyhyte, and asbolane-buserite while diagenetic nodules are dominated by buserite I, birnessite, todorokite, and asbolane-buserite.
2.
Many metal oxides have been found to have water oxidation catalytic activity, including ruthenium ( IV ) oxide ( RuO 2 ), iridium ( IV ) oxide ( IrO 2 ), cobalt oxides ( including nickel-Co 3 O 4 ), manganese oxide ( including layered MnO 2 ( birnessite ), Mn 2 O 3 ), and a mix of Mn 2 O 3 with CaMn 2 O 4.
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