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materiały: Ulexite

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Ulexite (), sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB5O6(OH)6·5H2O.

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Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883), who first discovered it.

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Ulexite (), sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB5O6(OH)6·5H2O. The mineral occurs as silky white rounded crystalline masses or in parallel fibers. Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883), who first discovered it. The natural fibers of ulexite act as optical fibers, transmitting light along their long axes by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side. The fiber-optic effect is the result of the polarization of light into slow and fast rays within each fiber, the internal reflection of the slow ray and the refraction of the fast ray into the slow ray of an adjacent fiber. An interesting consequence is the generation of three cones, two of which are polarized, when a laser beam obliquely illuminates the fibers. These cones can be seen when viewing a light source through the mineral. Ulexite is found in evaporite deposits, and the precipitated ulexite commonly forms a "cotton ball" tuft of acicular crystals. Ulexite is frequently found associated with colemanite, borax, meyerhofferite, hydroboracite, probertite, glauberite, trona, mirabilite, calcite, gy…

Kategoria: technologia

Rodzina: jezyk-i-slowa

Jakość źródła: 65/100

Próby weryfikacji: 3

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Ulexite (), sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB5O6(OH)6·5H2O. The mineral occurs as silky white rounded crystalline masses or in parallel fibers. Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883), who first discovered it. The natural fibers of ulexite act as optical fibers, transmitting light along their long axes by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side. The fiber-opt…

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The Application and Microstructural Analyses of Newly Developed Luster Glazes on Different Clay Bodies.. This study describes the microstructural and chemical characteristics of luster glazes applied to white clay and chamotte clay bodies using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD). Surface and cross-sectional analyses were performed to evaluate glaze morphology, the glaze-body interface, and the formation of metallic phases responsible for the luster effect. SEM observations indicated that the glaze applied to the white clay body exhibited greater thickness uniformity and a well-defined transition zone. In contr…

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Molecular adsorption mechanism of methylene blue dye on ulexite.. In this study, the molecular adsorption mechanism of methylene blue dye on ulexite and the adsorption kinetics and thermodynamics were investigated. Ulexite is a boron mineral containing boron, sodium and calcium. The regression coefficients of Langmuir isotherm, Freundlich isotherm and Dubinin-Radushkevich (DR) isotherms were compared. Adsorption of methylene blue on to ulexite was investigated thermodynamically. The most appropriate kinetic model was determined using pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The molecular adsorption mechanism of methylene blue on ulexite was schemat…

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