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Gibbsite

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gibbsite [′gib‚zit]
(mineralogy)
Al(OH)3A white or tinted mineral, crystallizing in the monoclinic system; a principal constituent of bauxite. Also known as hydrargillite.

Gibbsite 

(also hydrargillite), a mineral with the chemical composition Al[OH]3. It contains 65.4 percent alumina (A1203); admixtures of Fe3+ and Ga3+ that replace Al3+ in the structure are known. Gibbsite crystallizes in a monoclinic system. Its crystalline structure is of the layer type and consists of bifoliate (OH) packets, in the midst of which Al3+ ions are distributed. Good cleavage occurs along weak interpacket bonds. Gibbsite forms small laminar crystalline particles, usually colorless with a pearly luster, as well as powdery aggregates and incrustations with a radiated or imbricate microstructure. Its hardness on the mineralogical scale is 2.5-3.5; its density is 2,300-2,400 kg/m3. It usually forms upon weathering of alumina-rich rocks. Together with the other hydroxides of aluminum (diaspore and boehmite) and iron, gibbsite is found in bauxite ores. Gibbsite bauxites are among the best aluminum ores.



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It was historically used as an ore of aluminum and later in the electrolytic processing of the aluminum rich oxide ore bauxite (itself a combination of aluminum oxide minerals such as gibbsite, boehmite and diaspore).
In the literature, nanoencapsulation of colloidal nanoparticles has included metals (Au, Ag, Fe/Fe2O3), semiconductors (CdS, ZnS, CdSe/ZnSe), polymers (polystyrene, polydimethylsiloxane), and inorganic oxides (boehmite rods, gibbsite platelets).
In difference, it can be noted that aluminum hydroxide occurs as gibbsite and vesuvianite ferrian is replaced by vesuvianite [Ca.
 
 
 
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