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- W2277766069 abstract "Graphical and mathematical representations of the extinction angles, interference figure and birefringence expected on any section through a biaxial crystal can be calculated from a few primary data: optic angle and sign, principal refractive indices and the orientation of the indicatrix with respect to the crystal lattice. The section for which the optical properties are calculated can be identified either by its optical character or with reference to a crystallographic feature. If the optical properties are represented by vectors then it is relatively easy to relate optical and crystallographic features with vector algebra. A unit vector parallel to the wave normal in orthoscopic light identifies the section. If necessary, the components of the wave normal vector are transformed from the crystal lattice reference frame to the indicatrix reference frame and the optical properties are calculated from optical theory. Results include a set of mutually consistent determinative curves for plagioclase; a rapid, semi-quantitative method for estimating the compositions of olivines in lava flows; a demonstration of the necessary consequences of epitaxial overgrowths of augite on hypersthene; the determination of twin laws in pyroxenes; and the detection of crystallographic orientation of minerals in rocks." @default.
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- W2277766069 date "1985-01-01" @default.
- W2277766069 modified "2023-09-24" @default.
- W2277766069 title "Computer-generated aids for the study of minerals in thin section" @default.
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