What we know about your mineral so far: Metallic luster Does NOT scratch glass Use chart on the right to determine your mineral.

Mineral Identification Chart Mineral Description Galena lead ore PbS Silvery in color heavy H: 2.5 G: 7.6 perfect cubic cleavage lead gray streak Chalcopyrite CuFeS2 Brass-yellow in color tarnishes to purple H: 3.5-4 G: 4.5 green-black streak Sphalerite zinc ore ZnS Brown, black, or yellow in color 6 directions of cleavage H: 3.5-3.5 G: 4 yellow, brown or white streak that has a rotten egg smell Key H=hardness // F=fracture // L=luster // S=streak // G=specific gravity