Molybdenite

Mineral
Molybdenite is a soft, silvery-gray mineral composed of molybdenum disulfide (MoS₂). It is the primary ore of molybdenum, a metal used to strengthen steel and in high-temperature applications. Molybdenite has a greasy feel and a hexagonal crystal structure, similar to graphite, allowing it to function as a dry lubricant. It commonly forms in hydrothermal veins and porphyry deposits.