Palygorskite


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palygorskite

[‚pal·ə′gȯr‚skīt]
(mineralogy)
A chain-structure type of clay mineral.
A group of lightweight, tough, fibrous clay minerals showing extensive substitution of aluminum for magnesium.

Palygorskite

 

(named after the Palygorskii section of the former Perm’ Mining District), a hydrous magnesium silicate with the approximate chemical formula Mg5[Si4O10]2(OH)2(H2O)4 · 4H2O. Part of the Mg is replaced by Al, and admixtures of Fe3+, Ca, Na, and K oxides are known to occur. According to crystal structure, palygorskite occupies an intermediate position between inosilicates and phyllosilicates. Aggregates exhibit a felted or leather-like structure and occur in the form of crusts. The monoclinic crystals, which resemble thin fibers, are white, light gray, pink, or yellow. Palygorskite has a hardness on Mohs’ scale of 2–2.5 and a density of 2,000–2,300 kg/m3. Its hardness increases substantially after roasting, and the mineral gradually loses water upon heating.

Palygorskite is mainly formed during the weathering of rocks rich in magnesium. It occurs in sedimentary rocks in the form of nests, interstratifications, and, less frequently, large individual aggregates. Palygorskite is used as heat insulation and soundproofing by the construction industry.

References in periodicals archive ?
Smectite, illite, chlorite and palygorskite were the main minerals in the clay fraction; and the silt fraction was dominated with quartz and minor contents of smectite, illite, chlorite and feldspar.
In this work, palygorskite as base material was combined with certain amount of TiO2 to prepare a novel composite carrier TiO2-palygorskite, followed by the dipping load of 10wt% Ce, to prepare a series of Ce/ TiO2-palygorskite catalysts, which were further treated by the Non-thermal Plasma (Ar).
Palygorskite (Pal) is a common clay mineral, which has a large surface area, a moderate layer charge, ion-exchange and adsorption ability, and rheological and catalytic properties with its special micropores and channels, fine particle size and fibrous habit [1] and these characters make it be applicable for use in many industries as well as animal nutrition [2].
The geochemical analysis (XRD) finds that quartz, dolomite and albite are the major mineral constituents, whereas aluminium, magnesium, sodium, palygorskite and dickite are minor constituents.
Tenders are invited for Bentonite (kaolinite-hydromica, palygorskite) clay powder for the production of a grouting mortar
Styrene butadiene rubber (SBR) and palygorskite with and without organomodification were subjected to RTFOT.
Lu et al., "Catalytic degradation of gaseous benzene by using Ti[O.sub.2]/goethite immobilized on palygorskite: preparation, characterization and mechanism," Solid State Sciences, vol.
Ding, "Pickering emulsions stabilized by palygorskite particles grafted with pH-responsive polymer brushes," RSC Advances, vol.
Peaks at 2[theta] = 20.9[degrees], 26.8[degrees], 50.3[degrees] and 61 o are attributed to the presence of silica [SiO2] and at 12.4[degrees], 19.8[degrees] and 27.8[degrees] owing to palygorskite. montmorillonite shows diffraction peak at 2[theta] = 8.9[degrees] (d 001 reflection), 19.7[degrees], 32.1[degrees], and 62[degrees].
Sorptive removal of tetracycline from water by palygorskite, Journal of Hazardous Materials 165: 148-155.
Su, "Performance and mechanisms of fluoride removal from groundwater by lanthanum-aluminum-loaded hydrothermal palygorskite composite," Chemical Research in Chinese Universities, vol.