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Polymetallic nodules, also called manganese nodules, are mineral concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. As nodules can be found in vast quantities, and contain valuable metals, deposits have been identified as a potential economic interest. [ 1 ]
Nodule is also used for widely scattered concretionary lumps of manganese, cobalt, iron, and nickel found on the floors of the world's oceans. This is especially true of manganese nodules. Manganese and phosphorite nodules form on the seafloor and are syndepositional in origin. Thus, technically speaking, they are concretions instead of nodules ...
Kutnohorite is a rare calcium manganese carbonate mineral with magnesium and iron that is a member of the dolomite group. It forms a series with dolomite, and with ankerite.The end member formula is CaMn 2+ (CO 3) 2, [6] but Mg 2+ and Fe 2+ commonly substitute for Mn 2+, with the manganese content varying from 38% to 84%, [2] so the formula Ca(Mn 2+,Mg,Fe 2+)(CO 3) 2 better represents the species.
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The CCZ is regularly considered for deep-sea mining due to the abundant presence of manganese nodules. The CCZ extends around 4,500 miles (7,240 km) East to West [4] and spans approximately 4,500,000 square kilometres (1,700,000 sq mi). [5] The fractures themselves are unusually mountainous topographical features.
Buserite is a hydrated layered manganese-oxide mineral with nominal chemical formula MnO 2 ·nH 2 O. It was named after Swiss chemist professor Wilhelm Buser (1917-1959), who first identified it in 1952 in deep-sea manganese nodules. Buser named it 10 Å manganate because the periodicity in the layer stacking direction was 10 Å.
Tephroite is the manganese endmember of the olivine group of nesosilicate minerals with the formula Mn 2 Si O 4. A solid solution series exists between tephroite and its analogues, the group endmembers fayalite and forsterite. Divalent iron or magnesium may readily replace manganese in the olivine crystal structure.
Hence I propose to merge Ferromanganese nodules into this article. Lithopsian 17:04, 25 May 2023 (UTC) @Lithopsian: agreed. Support merging as ferromanganese nodules seems to be a class of manganese nodules with a certain mineral or trace metal composition. RFZYN SPY talk 06:19, 30 May 2023 (UTC)
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