Recently the silver arsenate mineral theuerdankite has been IMA approved (Copyright M. Groß, Lengede) It occurs in dark mm-sized crystals with native silver and iodargyrite and was found at the Theuerdank mine, St. Andreasberg, Harz, Germany. Gysinite-Ce, another sample provided by M. Groß from the Theuerdank mine, was IMA approved as well. It occurs as tiny sub-mm sized crystals of orange colour. Thanks for the contribution, M. Groß!
