Topic
Vermiculite
About: Vermiculite is a research topic. Over the lifetime, 2320 publications have been published within this topic receiving 37142 citations.
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TL;DR: In this article, two vermiculite hybrids containing aliphatic amines intercalated were synthesized, and the results showed that the intercalation process is associated with the conformation of the guest molecule and the presence of the compensate cation inside the interlayer cavity.
13 citations
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TL;DR: In this paper, the nature of weathered biotite in sand-sized fractions in two Gray Luvisols developed from Wisconsinan-age glacial till under Boreal Forest in east central Saskatchewan was studied.
13 citations
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TL;DR: In this article, chemical changes during the natural alteration of micas were studied by electron microprobe and classical chemical analyses of fresh and altered portions of mica flakes from 10 Canadian mineral deposits.
Abstract: Chemical changes during the natural alteration of micas were studied by electron microprobe and classical chemical analyses of fresh and altered portions of mica flakes from 10 Canadian mineral deposits. Results of 50 new analyses are discussed in five examples, starting from simple changes in the interlayer followed by exsolution of titania and ending with complex replacements of anions and cations in all layers of the mica structure. Alteration of micas starts along 001 cleavage planes and fractures and gradually extends into the entire flake leaving some or no remnants of the host mica. The removal of ions from the mica structure and from the flake takes place by gradual depletion, by exsolution of oxides, and/or by alternating removal and redeposition of a newly-formed oxide, illustrated in the following example of the removal of Ti;
Residual minerals replacing the original micas are secondary and recrystallized micas, chlorite, vermiculite, serpentine, talc and depleted, optically amorphous flakes. Newly-formed minerals which may incorporate the released ions into their structures are rutile, anatase, sericite, hydronepheline, chlorite-serpentine aggregates, goethite and jarosite. The following partly-altered micas are indicative of sulphide mineralization;
13 citations
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TL;DR: The sediments in Blackstrap Lake, a prairie lake, contain over 90% of the non-clay fractions and its pH is near neutrality as discussed by the authors. But organic matter of the lake sediments is relatively less important in the adsorption of arsenite.
Abstract: The sediments in Blackstrap Lake, a prairie lake, contain over 90% of the non-clay fractions and its pH is near neutrality. Calcium and Mg carbonates, sesquioxidic components and their complexes with silica are present in a series of particle size fractions. The major clay minerals of the sediments are mica, montmorillonite, chlorite, vermiculite, kaolinite, and quartz.
Organic matter of the lake sediments is relatively less important in the adsorption of arsenite. Calcium and Mg carbonates, micas, vermiculite, montmorillonite, kaolinite and chlorite are the active components but not the dominant components of the lake sediments in adsorbing arsenite. The porous sesquioxides and silico-sesquioxidic complexes present in a series of particle size fractions (clay, silt and sand). are the primary components in adsorbing arsenite. The retention of arsenite by these active components present in sediments would suppress the level of arsenite in fresh water and may thus restrain its movement to the food chain.
13 citations
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TL;DR: In this paper, microprobe and atomic absorption analyses of large vermiculite crystals present in the upper horizon of a weathering profile on gabbro show that they differ appreciably in chemical composition.
Abstract: Microprobe and atomic absorption analyses of large vermiculite crystals present in the upper horizon of a weathering profile on gabbro show that they differ appreciably in chemical composition. This together with the lack of any phyllosilicate precursor of comparable grain size, strongly suggests that the vermiculites were formed by precipitation of dissolved silicate matter, higher in the profile the vermiculite becomes unstable and is replaced by an Fe-rich smectite.
13 citations