Abstract
The microtexture of several quartz grains and of their first neighbours from a quartzo-feldspathic tectonique is studied. Each group of grains belongs to a different minéralogie bed. The deformation of this tectonite can be described as the plastic flow of quartz between rigid feldspathic layers. The microtextures which are obtained are very simple and show two types of [0001] pole concentrations, situated in a plane, normal to the main flow plane and at 450 on the flow direction. Each grain and its neighbours reached a stable microtexture in steady stage of geological flow. Hypo-thetically, it is assumed prismatic {1010} <c> and <a> and pyramidal glide systems correspond to these two types of stable pole concentrations and explain the main shape of the grains.
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