Sulfur (atomic number: 16, symbol: s) is yellow, odorless, brittle, solid and insoluble in water, but soluble in carbon disulfide. It can found in meteorites, volcanoes, and hot springs and as galena, gypsum, Epsom salts, and barite. Sulfur is used in black gunpowder, the vulcanization of natural rubber, making phosphatic fertilizers, fumigation, and to bleach dried fruits. The element is a good insulator and a minor constituent of fats, body fluids, and skeletal minerals.