Molybdenite [mo-lib-de-nite] is a mineral (molybdenum disulfide, MoS2). Similar in appearance and feel to graphite, molybdenite has a lubricating effect that is a consequence of its layered structure, which consists of a sheet of molybdenum atoms sandwiched between sheets of sulfur atoms. The Mo-S bonds are strong, but the interaction between the sulfur atoms at the top and bottom of separate sandwich-like tri-layers is weak, resulting in easy slippage as well as cleavage planes.
Molybdenite occurs in high temperature hydrothermal ore deposits. Important deposits include the disseminated porphyry molybdenum deposits at Questa, New Mexico and the Henderson and Climax mines in Colorado. Molybdenite flakes are being researched for their potential use in low power semiconductors.
