Rough piece of orange/brown sphalerite var schalenblende intermixed with white dolomite. The schalenblende fluoresces a nice orange, while the dolomite fluoresces white. The fluorescence is best observed under longwave UV light (or even 405nm blue laser). The dolomite is slightly phosphorescent. There are also patches of a metallic mineral, likely galena.
From: Raibl Mines, Cave del Predil, Tarvisio, Udine Province, Friuli Venezia Giulia, Italy
Dimension: 8 x 5 x 5 cm, 265 g