Biggest crystal : 0.5 cm Ex Coll. C. Martaud. Exposed in YMC showcase, SMAM 2023. This specimen has been found by M. Gallo, miner director during this period, in 1964. A tungsten anomaly inside the structure give to those crystals this bluewish color. This found and its caracterizations were detailled in a scientific publication : Dietrich J., Note et Mémoire du Service Géologiques (Morocco), 132, 241 (1972) ISSN : 0369-1748 "Wulfenite from the Bou-Skour Mine, Patte d'oie Region, Jbel Sarko, Morocco"