Microfibrous quartz varieties: characterization by quantitative X-ray texture analysis and transmission electron microscopy

Article Abstract:

The fiber elongation direction of microfibrous quartz varieties in materials with narrow bands of thinly spaced radially divergent spherulitic bundles was characterized using quantitative X-ray texture analysis. A transmission electron microscope was used to examine the microstructures of agate samples containing quartzine, chalcedony and pseudochalcedony. Results showed that large concentrations of polysynthetic Brazil twins and domains having a modulated microstructure were present in all types of microfibrous quartz.

Usage, X-ray crystallography, Transmission electron microscopes, Agates, Quartz fibers

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Characterization of magnetite particles in shocked quartz by means of electron- and magnetic force microscopy: Vredeforte, South Africa

Article Abstract:

The authors discuss their use of electron microscopy to analyze magnetite particles of shocked quartz. Topics include orientation of quartz grains, formation of microcrystalline phases due to micro-melts, and planar deformation features in quartz.

South Africa, Methods, Analysis, Electron microscopy, Crystallization, Electrons, Electron diffraction, Magnetite

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