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- W1973205773 abstract "Ultra-structural variations in samples of nephrite jade have been elucidated by a combination of high resolution electron microscopy, which explores local structure in a direct, ‘real space’ manner, and computational procedures using the so-called ‘multislice’ approach which enables the image generated under a given set of electron-optical conditions to be calculated as a function both of unit cell content and of specimen thickness. Microanalyses by electron-stimulated X-ray emission and by optical diffractometry (of micrographs) were also used. Planar faults on (010) occur frequently in nephrite. These are of several distinct kinds, all of which have been characterized. The host amphibole, consisting of double chains of linked SiO 4 tetrahedra, is shown frequently to accommodate triplechain lamellae which are coherently attached to the double-chain matrix on (010) planes. These triple-chain faults may occur in isolated fashion, but sometimes are arranged recurrently, in a disordered manner, within the amphibole host. The nephrite may also accommodate extended regions of a new, triple-chain mineral structure, the maximum observed width of this coexistent phase being ca. 340 A. Other planar faults, composed of regions with chain widths ranging from one to six SiO 4 tetrahedra, have been detected and fully identified on the basis of the correspondence between theoretically calculated and observed images. Detailed structural drawings for the continuous planar faults, as well as others that are described, are given. It is shown that edge-sharing of tetrahedra probably occurs close to the termini of certain types of discontinuous fault and that, in other cases of defect termination, screw-type dislocations may be incorporated to preserve the strain-free, structural regularity of the host. It has not yet proved possible, with currently available in situ X-ray microanalytical techniques, to assign chemical compositions to the new structural types that have been brought to light by this study." @default.
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- W1973205773 date "1980-02-29" @default.
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- W1973205773 title "The internal structure of nephrite: experimental and computational evidence for the coexistence of multiple-chain silicates within an amphibole host" @default.
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- W1973205773 doi "https://doi.org/10.1098/rsta.1980.0149" @default.
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