“Interesting specimen of quartz crystal included in realgar. This is often mistaken for chabourneite or pierrtotie crystal... FOV 1,7 mm Collected by Georges Favreau and Vincent Bourgoin with the written authorization of the national Parc des Ecrins during the study of the deposit by the Jean Wyart association. Photo : Vincent Bourgoin This photo was published in "Bourgoin, V., Favreau, G., Boulliard, J.-C. (2011): Jas Roux: un gisement exceptionnel à minéraux de thallium. Le Cahier des Micromonteurs, 3-2011, 2-91". ”