Gibbsite and List of minerals

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Difference between Gibbsite and List of minerals

Gibbsite vs. List of minerals

Gibbsite, Al(OH)3, is one of the mineral forms of aluminium hydroxide. This is a list of minerals for which there are articles on Wikipedia.

Aluminium

Aluminium or aluminum is a chemical element with symbol Al and atomic number 13.

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Bauxite

Bauxite is a sedimentary rock with a relatively high aluminium content.

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Brucite

Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)2.

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Clay minerals

Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces.

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Corundum

Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium and chromium.

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Illite

Illite is a group of closely related non-expanding clay minerals.

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Kaolinite

Kaolinite is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4.

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Mica

The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage.

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Mineral collecting

Mineral collecting is the hobby of systematically collecting, identifying and displaying mineral specimens.

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Montmorillonite

Montmorillonite is a very soft phyllosilicate group of minerals that form when they precipitate from water solution as microscopic crystals, known as clay. It is named after Montmorillon in France. Montmorillonite, a member of the smectite group, is a 2:1 clay, meaning that it has two tetrahedral sheets of silica sandwiching a central octahedral sheet of alumina. The particles are plate-shaped with an average diameter around 1 μm and a thickness of 9.6 nm; magnification of about 25,000 times, using an electron microscope, is required to "see" individual clay particles. Members of this group include saponite. Montmorillonite is a subclass of smectite, a 2:1 phyllosilicate mineral characterized as having greater than 50% octahedral charge; its cation exchange capacity is due to isomorphous substitution of Mg for Al in the central alumina plane. The substitution of lower valence cations in such instances leaves the nearby oxygen atoms with a net negative charge that can attract cations. In contrast, beidellite is smectite with greater than 50% tetrahedral charge originating from isomorphous substitution of Al for Si in the silica sheet. The individual crystals of montmorillonite clay are not tightly bound hence water can intervene, causing the clay to swell. The water content of montmorillonite is variable and it increases greatly in volume when it absorbs water. Chemically, it is hydrated sodium calcium aluminium magnesium silicate hydroxide (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2·nH2O. Potassium, iron, and other cations are common substitutes, and the exact ratio of cations varies with source. It often occurs intermixed with chlorite, muscovite, illite, cookeite, and kaolinite.

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