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Molybdenum Compounds
   Molybdenum disulfide
Molybdenum disulfide MoS2
The structure, appearance, and feel of molybdenum disulfide is similar to graphite - a sandwich of layers of molybdenum atoms between the layers of sulfur atoms.
Finely powdered MoS2 with particle sizes in the range of 1-100 um is a common dry lubricant. It is also often mixed into various oils and greases, which allows the mechanisms lubricated by it to keep running for a while longer, even in cases of almost complete oil loss - finding an important use in aircraft engines. It is also used as a lubricating additive to special plastics, notably nylon and teflon.
Another application is for coating bullets, giving them easier passage through the rifle barrel with less deformation and better ballistic accuracy.