EntityQ2257471· pop 10· linked from 176 articleswadSign in to saveporous secondary manganese oxides, mainlyConnectionsironEntitymanganeseEntityWikisourceEntityminingEntityoxideEntityoreEntityhydroxide saltEntitylimoniteEntitypyrolusiteEntityEncyclopædia Britannica 11th editionEntitymineraloidEntitybirnessiteEntityWADEntitynsutiteEntityCategoriesHydratesHydroxide mineralsManganese mineralsOxide minerals