Image source: Mineralogical Information Institute, courtesy of the Smithsonian Institution.
Molybdenite is a soft, gray sulfide mineral (MoS2), the chief ore of molybdenum. It is found in pegmatites, igneous, and metamorphic rocks. It has hexagonal system tabular prisms, flakes, and fine granules and is lead-gray in color with a metallic luster. Hardness 1–1.5, relative density 4.7.