Results 81 to 90 of about 127 (124)
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Geochemistry of the Trioctahedral Micas from Degana Granite
Journal of the Geological Society of India, 2007Abstract The composition of micas from Degana granite show significant chemical variation and trioctahedral nature. High Al2O3 and FeO content and a very distinctive depletion in MgO characterize the biotite whereas zinnwaldite has comparatively lower FeO and MgO. The biotites plot in the field of lithian-siderophyllite.
Pankaj K Srivastava, null Sukhchain
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Lithium in the interlayer space of synthetic trioctahedral micas
Chemical Geology, 1983Abstract This paper gives several new and strong arguments in favour of the possibility of fixation of anhydrous lithium in the interlayer space of trioctahedral potassium micas. From the chemical viewpoint Li+ can replace K+, but is located out of the alkaline cation site; it enters pseudo-octahedral cavities limited by the triangular bases of two ...
J.-L. Robert +3 more
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Dielectric Properties of a Di-trioctahedral Chlorite: Cookeite
Transactions of the Indian Ceramic Society, 1988Temperature and frequency variations of the dielectric constant (K), loss (tan δ) and conductivity of a di-trioctahedral chlorite (cookeite) were measured in the temperature range 30°—400°C and frequency range 102—107 kHz. The variational patterns of these parameters of cookeite have been compared with those of ripidolite, a tri-trioctahedral chlorite ...
S. Lokanatha +2 more
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Hydrothermal Synthesis of Low Layer Charge Trioctahedral Smectite
2021Smectites are widely used in (geo-) technical applications and are important components of soils. A definition gap exists between the uncharged non-swellable pyrophyllite and talc (ξ = 0) and the low charged swellable clay minerals (smectites) with 0.2 ≤ ξ ≤ 0.6. Furthermore, no reliable measurement method exists for ξ < 0.2.
Yi-Yu , Liu +3 more
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Stoichiometry of a dissolution reaction of a trioctahedral vermiculite at pH 2.7 [PDF]
Geochimica et Cosmochimica Acta, 2009 Abstract Transformation of vermiculite to hydroxy-interlayered vermiculites (HIV) significantly modifies the physicochemical properties of the original mineral. HIV is a common phase in acid soils, nevertheless its formation remains poorly understood.
Mareschal, Louis +2 more
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Biotites Intermediate Between Dioctahedral and Trioctahedral Micas
Clays and Clay Minerals, 1967AbstractOrange-yellow detrital flakes of biotite are common carriers of potassium and trace elements in soils and clays. Because the flakes differ in degree of alteration and may be derived from different sources, it is difficult to obtain homogeneous material for studies of their physical and chemical properties that may be compared with the original ...
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Magnetic Order in Trioctahedral Sheet Silicates
1985Abstract Data on the magnetic susceptibility, magnetization, Mössbauer spectra, magnetic neutron scattering, and computer simulation of the magnetic ground state of representative Fe-rich trioctahedral phyllosilicates are reviewed. The principal exchange interaction, between Fe2+ in edge-sharing octahedra in the octahedral sheets, is ...
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Polytypism of Trioctahedral 1:1 Layer Silicates
Clays and Clay Minerals, 1969AbstractPolytypism in trioctahedral 1 : 1 phyllosilicates results from two variable features in the structure. (1) The octabedral cations may occupy the same set of three positions throughout or may alternate regularly between two different sets of positions in successive layers.
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Salt Displacement and Titration of AlCl3‐Treated Trioctahedral Vermiculites
Soil Science Society of America Journal, 1967Abstract Freshly prepared and 45‐day‐aged Al‐saturated trioctahedral vermiculites from Libby, Montana, and northeastern Transvaal, South Africa, were: (i) leached with 1 N and 0.05 N solutions of NaCl, KCl, and CaCl
Malek T. Kaddah, N. T. Coleman
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Characterisation of synthetic trioctahedral micas by Mössbauer spectroscopy
Hyperfine Interactions, 1998Trioctahedral potassium micas |K}[M3]〈T4〉O10(OH)2 have been synthesized by hydrothermal techniques with various cationic substitutions in the octahedral and the tetrahedral sheet. Taking annite |K}[Fe32+]〈AlSi3〉O10(OH)2 as the reference mineral, [Fe2] was replaced by [Mg2] and [Ni2], 〈Al3+〉 by 〈Fe3+〉 and finally [Fe2+] + 〈Si4+〉 by [Al3+] + 〈Al3 ...
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