Molybdenum disulfide is naturally found in molybdenite mineral form and has a very similar appearance to graphite. While molybdenum sulfide is poorly soluble in water, it mixes easily with hot water in some inorganic acids such as nitric, sulfuric and hydrochloric acid. In its pure form, this product is used as a lubricant. Pure molybdenum disulfide is used as an additive for gear motor oils. It reduces the friction coefficient and provides frictionless surface formation by filling rough metal surfaces. It is an ideal filler for high temperature applications.