Excellent combo formed by a group of ferberite crystals with parallel growths, with an intense black color and good brightness, peppered by lenticular siderite crystals. They are ed by a hyaline quartz crystal partially covered by muscovite. Note that quartz has a small dent on one of the faces of the terminal rhombohedra, without affecting the aesthetics of the sample. Arsenopyrite has grown on the ferberite. A specimen with a superb aesthetics, from a classic locality like Panasqueira. a2w5x