SEARCH Articles Figures Tables Manganese amorphous forms Manganese catalase superoxidized form Manganese crusts hydrogenous formed Manganese crusts hydrothermal formed Manganese crystalline forms Manganese layered forms Manganese nodules diagenetic formed Manganese nodules hydrogenous formed Manganese nodules hydrothermal formed Manganese oxide minerals formed Manganese oxide minerals formed environments Manganese-rich deposits, forms