Under uniaxial load applied in the direction of the polar X 1-axis Dauphiné twins are formed in α-quartz. By measuring the net polarization charge of the stressed crystal as well as by direct visualization of the twins it was observed that these twins have a pronounced tendency to disappear on removal of the load.Dans un cristal de quartz une contrainte uniaxiale parallèle à l'axe polaire (X1) crée des macles du Dauphiné. Des mesures de charges de polarisation ainsi que des observations optiques montrent que les macles disparaissent lors de la suppression de la contrainte mécanique
