Structure of a Talc/Saponite Mixed-Layer Mineral

Alietti, Alfredo; Mejsner, J.

doi:10.1346/ccmn.1980.0280509

Cited by 13 publications

(7 citation statements)

References 3 publications

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“…According to Faust & Murata [47], Veniale and Van der Marel [48], Grimshaw [49], Alietti and Mejsner [1], and Post [50], the endothermic decomposition of pure talc and saponite, as well as talc-saponite interstratifications involves crystallization of enstatite and cristobalite. Decomposition (endothermic) and recrystallization (exothermic) are out of the temperature range (up to 1100 • C) of conventional STA measurement systems [1,[48][49][50].…”

Section: Interstratification Studiesmentioning

confidence: 99%

“…Decomposition (endothermic) and recrystallization (exothermic) are out of the temperature range (up to 1100 • C) of conventional STA measurement systems [1,[48][49][50]. In contrast, the investigated turbostratic talc-saponite interstratification showed an exothermic peak with a maximum at 815 • C superimposing with the endothermic dehydroxylation of the interstratification.…”

Section: Interstratification Studiesmentioning

confidence: 99%

“…Turbostratic talc/trioctahedral smectite interstratifications occur, for example, in the Province Parma (Italy) [1], in the Armagosa Desert (Nevada) [2], and in the Madrid basin (Spain) [3][4][5][6], which is the most extensive studied locality. The interstratifications are often very fine-grained and analysis and description of the interstratification is still difficult.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a Fine-Grained Interstratification of Turbostratic Talc and Saponite

et al. 2017

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Abstract:Interstratifications of talc and trioctahedral smectites from different provenances are used as indicators for geological environments and for geotechnical and technical applications. However, comprehensive layer characterization of these interstratifications is rare. Sample EX M 1694, a clay with red-beige appearance from the Madrid basin was studied by X-ray diffraction analysis, X-ray fluorescence analysis, Fourier transformation infrared spectroscopy, simultaneous thermal analysis, gas adsorption measurements, cation exchange capacity, and environmental scanning electron microscopy. More than 95% of particles in EX M 1964 belong to the clay fraction <2 µm. It contains 75% interstratification of 30% turbostratic talc, and 70% saponite type III and 25% turbostratic talc. The turbostratic talc(0.3)/saponite interstratification is characterized by a low number of layers per stack (3), small lateral dimension of layers (60-80 nm) and, accordingly, a high specific surface area (283 m 2 /g) with nearly equal surface area of micro-and mesopores. Thus, the studied material can be used as mined for adsorption, in contrast to acid-treated clays that produce hazardous waste during production. Low particle size of the interstratification drastically reduced thermal stability and dehydroxylation was superimposed by recrystallization of high temperature phases already at 816 • C, which is low for trioctahedral 2:1 layer minerals.

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Section: Interstratification Studiesmentioning

confidence: 99%

Section: Interstratification Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of a Fine-Grained Interstratification of Turbostratic Talc and Saponite

et al. 2017

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“…The zeolitic minerals used in this study were heulandite-clinoptilolite rich intermediate species with Si/Al of 4.03 and 3.83 and M ++ /M + of 0.84 and 0.79 for CL1 and CL2, respectively, according to the classification of Alietti [16]. In this classification, the ranges of Si/Al and P M þþ = P M þ for heulandite-clinoptilolite are 3.45-4.35 and 0.73-2.06, respectively.…”

Section: Identification and Modification Of Zeolitic Materialsmentioning

confidence: 99%

Aqueous interactions of zeolitic material in acidic and basic solutions

Polatoğlu

Çakıcıoğlu-Özkan

2010

Microporous and Mesoporous Materials

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a b s t r a c tAqueous interactions of natural zeolitic material in as-received and modified forms were studied. The zeolitic materials was interacted with acidic (hydrochloric acid, lactic acid, acetic acid) and basic (sodium hydroxide) solutions. Ion exchange, adsorption, complex formation, precipitation and cation hydrolysis were possible interaction mechanisms affected by the amount and cation content of zeolite and pH. The dominant mechanisms seemed to be ion exchange and adsorption in HCl solution when zeolite was used in the as-received form, but dissociation of outer-sphere complexes when modified zeolite was used. In lactic acid, acetic acid as well as the basic solution, cation hydrolysis and complex formation were additional mechanism in the interactions.

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“…Three occurrences have been reported: (1) in serpentinized rocks from Monte Chiaro in th e Taro Valley of Italy (Alietti and Mejsner, 1980, and earlier reports by Alietti), (2) in weathered serpentine from Ferriere in the Nure Valley of Italy van der Marel, 1968, 1969), and (3) in Precambrian dolomites in the Congo (Guenot, 1970). The study of Alietti and Mejsner (1980) for the Monte Chiaro sample is the most rigorous. They showed that 10 orders of basal reflections occur in the untreated sample with equal diffraction breadths for the even and odd values.…”

Section: Aliettitementioning

confidence: 90%

Report of the Clay Minerals Society Nomenclature Committee for 1980–1981

Bailey¹

1982

Clays and clay miner.

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Structure of a Talc/Saponite Mixed-Layer Mineral

Cited by 13 publications

References 3 publications

Characterization of a Fine-Grained Interstratification of Turbostratic Talc and Saponite

Characterization of a Fine-Grained Interstratification of Turbostratic Talc and Saponite

Aqueous interactions of zeolitic material in acidic and basic solutions

Report of the Clay Minerals Society Nomenclature Committee for 1980–1981

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