Mineral Composition of Araripe Black Shale by X-ray Microct

AbstractInvestigation of the clay mineralogy of forty-seven samples of sediments from boreholes in the western Nile Delta, an area little studied hitherto, and from surface sites on the mouth of the Nile and adjacent coast shows that the clay fractions consist of dominant iron-rich, dioctahedral, randomly interstratified smectite-illitcs together with kaolinite, illite and chlorite.Amounts of the constituent minerals of the clay fractions are estimated from their X-ray diffraction intensities, supported by selective dissolution chemical data, and a new method is used to estimate the proportion of expanding layers in randomly interstratified smectite-illite. The results, which confirm and extend the work of previous investigators, also show that there is little correlation between the clay mineral composition and texture of the sediments, only kaolinite being weakly linearly correlated with clay content. Transformation of 2:1 layer silicate minerals occurs within the buried sediments ; chlorite is transformed and smectite and illite interlayers redistributed within randomly interstratified smectite-illites.

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Application of X-Ray Diffraction to Study Mineralogical Dependence of Reduction: Disintegration Indices RDI of Blast Furnace Sinters

10.5772/intechopen.95086 ◽

2021 ◽

Author(s):

Hanna Krztoń ◽

Janusz Stecko

Keyword(s):

Blast Furnace ◽

Mineral Composition ◽

Rietveld Method ◽

Phase Identification ◽

X Ray Diffraction ◽

Static Susceptibility ◽

X Ray ◽

Mineral Components ◽

Static Resistance ◽

Blast Furnace Sinters

The aim of this research was to continue an examination of influence of mineral components of blast furnace sinters on their quality. Two of reduction-disintegration indices RDI were taken into account: static resistance to degradation RDI-1+6.3 and static susceptibility to degradation RDI-1-3.15. X-ray diffraction was used for phase identification and the Rietveld method was applied to study quantitative dependence. Static susceptibility to degradation RDI-1-3.15 showed clearly dependence on quantitative mineral composition, namely on quantities of magnetite, silicates and slag phases. Static resistance to degradation RDI-1+6.3 was also dependent on fractions of magnetite and silicates.

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MINERAL COMPOSITION AND STRUCTURAL FEATURES OF JEWELER AMMONITES FROM KOSTROMA REGION

Proceedings of higher educational establishments Geology and Exploration ◽

10.32454/0016-7762-2017-2-22-27 ◽

2017 ◽

pp. 22-27 ◽

Cited By ~ 1

Author(s):

D. A. Petrochenkov

Keyword(s):

Organic Matter ◽

Mineral Composition ◽

Structural Features ◽

Electronic Microscopy ◽

X Ray ◽

Black Color

Detailed mineralogical examination of ammonites of jewelry quality has been carried out by means of radiographical, X-ray microanalyses and electronic microscopy. The ammonites consist mainly of calcite, apatite and some cells are constituted of phosphorite. The walls and shell’s septums consist of apatite and calcite, which have replaced original aragonite and maintain inclusions of pyrite of globular shape, aluminosilicate and organic matter. Dispersed apatite determines the black color of walls and shell’s septums. The color and transparency of the calcite, filling up the shell’s chambers, are determined by the quantity of micropores and microinclusions, mainly of apaTite. Ammonites from Kostroma region by its decorative and technology characteristics will be able to use widely in jewelry and interior articles.

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Study on Mineral Composition of Some Coal Samples by X-ray Analysis

Journal of the Fuel Society of Japan ◽

10.3775/jie.44.9_633 ◽

1965 ◽

Vol 44 (9) ◽

pp. 633-640 ◽

Cited By ~ 1

Author(s):

Toshihiko Maruyama ◽

Kazuo Kobayashi

Keyword(s):

Mineral Composition ◽

X Ray

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Estimation of the Range of Variation in the Mineral Composition of Silicate Lake Bottom Sediments Using Data from XRD and XRF

Journal of Siberian Federal University Chemistry ◽

10.17516/1998-2836-0180 ◽

2020 ◽

pp. 260-272

Author(s):

Roman V. Smelyi ◽

Alexander L. Finkelshtein ◽

Igor S. Yakimov ◽

Alena A. Amosova ◽

Victor M. Chubarov

Keyword(s):

Phase Analysis ◽

Mineral Composition ◽

Bottom Sediments ◽

Fluorescence Analysis ◽

X Ray ◽

Group Content ◽

Lake Bottom ◽

Mineral Components ◽

Using Data ◽

Lake Bottom Sediments

A method is proposed for estimating the range of mineral group content in the cores of silicate bottom sediments of lakes based on the search for the minimum and maximum content of stoichiometric minals that make up the group of minerals, provided that the balance of the mineral composition and the content of elements in the sample is observed. The mineral components were determined using the method of qualitative X-ray phase analysis, the contents of the main rock-forming elements were determined by X-ray fluorescence analysis. Comparison with the results of quantitative X-ray phase analysis showed that the contents of mineral groups either lie in the range calculated in the extreme search procedure based on data on the element composition, or overlap with the calculated range within the measurement error. The systematic discrepancy between the results of calculating the range of content of the silicon dioxide phase and the results of quantitative X-ray phase determination of quartz observed for the samples under consideration is due to the presence of an X-ray amorphous phase of biogenic silica. The proposed method for estimating the range of mineral group content is easy to implement, uses the publicly available MS Excel software, and can be useful for estimating variations in mineral composition by core depth, in conditions of frequent shortages of individual sample material distributed between different methods of analysis

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Experimental Study on the Microstructure and Expansion Characteristics of Paleosol Based on Spectral Scanning

Journal of Spectroscopy ◽

10.1155/2021/6689073 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Wanjun Ye ◽

Yiqian Chen ◽

Chong Gao ◽

Tengfei Xie ◽

Hongjun Jing ◽

...

Keyword(s):

Mineral Composition ◽

High Speed ◽

Point Contact ◽

Total Content ◽

Particle Morphology ◽

Expansion Rate ◽

Undisturbed Soil ◽

X Ray ◽

Mineral Components ◽

Microscopy Techniques

To investigate the microstructure of paleosol and its expansion characteristics, the paleosol of the Zaosheng #3 tunnel of the Yinxi high-speed railway was studied. Based on X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), nuclear magnetic resonance (NMR), and scanning electron microscopy techniques (SEM), the microstructure of the paleosol was analyzed in terms of the mineral composition, formation elements, pore structure, and particle morphology. Five groups of undisturbed and remolded soils with different moisture contents were tested for the unloaded expansion rate and loaded expansion rate. The results show that the mineral components of the paleosol are mainly quartz, potash feldspar, calcite, and hematite, with the highest-content-component quartz accounting for 45.4% of the total content; the clay mineral composition of the paleosol has the highest content of montmorillonite at 12.3%. The elemental composition of the paleosol is dominated by Al, Si, Ca, and Fe, which form expansive mineral components such as quartz and montmorillonite, creating inherent conditions for expansibility of the paleosol. The T2 distribution curves of the undisturbed and remolded paleosol are composed of three peaks. The pore distribution of paleosol mainly includes medium pores, followed by large pores, and the contents of small pores and superlarge pores are very small. In terms of particle contact, the undisturbed soil is mostly in the form of “surface-surface” and “surface-edge” contact, and the remolded soil is mainly in the form of “point-surface” and “point-point” contact. The unloaded expansion rate of remolded soil is approximately twice that of undisturbed soil. The rate of loaded expansion of both soils decreases with increasing moisture content.

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