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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 ...
Pages in category "Manganese minerals" The following 54 pages are in this category, out of 54 total. ... Manganese nodule; Manganese oxide; Manganokhomyakovite;
Manganese is a silvery-gray metal that resembles iron. It is hard and very brittle, difficult to fuse, but easy to oxidize. [11] Manganese and its common ions are paramagnetic. [12] Manganese tarnishes slowly in air and oxidizes ("rusts") like iron in water containing dissolved oxygen. [13]
Manganite is a mineral composed of manganese oxide-hydroxide, MnO(OH), crystallizing in the monoclinic system (pseudo-orthorhombic). [3] Crystals of manganite are prismatic and deeply striated parallel to their length; they are often grouped together in bundles. The color is dark steel-grey to iron-black, and the luster brilliant and ...
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Triploidite is an uncommon manganese iron phosphate mineral with formula: (Mn, Fe) 2 PO 4 OH. It crystallizes in the monoclinic crystal system and typically occurs as elongated and striated slender prisms which may be columnar to fibrous. Its crystals may be pinkish to yellowish brown or red-orange. [2]
Nodule may refer to: Nodule (geology), a small rock or mineral cluster; Manganese nodule, a metallic concretion found on the seafloor; Nodule (medicine), a small aggregation of cells; Root nodule, a growth on the roots of legumes; A feature of mollusc sculpture; Nodule of vermis, an external feature of the cerebellum
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