An Introduction to the Study of Fabrics of Geological Bodies by Author B. Sander

By Author B. Sander

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Symmetry which has arisen through packing is widely distributed amongst fabrics which have originated both with and without human action. Anisotropy and symmetry through packing are shown by: the fine structure (lattice structure) of crystals; the apposition fabrics of sediments of mechanical origin; foundation materials compacted by vibration (a process which is of great technical importance); many living structures. g. mechanical apposition or compaction in the rotationally symmetrical field of the earth's attraction).

This principle, in fact, is the mutual portrayability of morphological and functional symmetry. It can be especially well elucidated in the concrete form in which it is encountered in fabric studies, as the portrayal of the symmetry of known systems consisting of the directed mechanical influences in the fabric of rocks. e. e. the fabric, of a body subjected to deformation. The analyses of grain-fabrics in the second part of this book will serve as excellent examples. The relation between morphology and directed function is typical of fabric study, if we consider both as possessing symmetry properties.

G. glass rods which are anisotropic in shape and optically isotropic internally; magnetically polar spheres which are isotropic in shape and anisotropic internally). In the case of shape-anisotropic components there is involved with each close-packing an inevitable geometrical, statistical, preferred orientation of components ("orienting by grain shape"), increasing to a characteristic limit. In the case of components which are shape-isotropic there is theoretically no development of preferred orientation according to grain shape.

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