Sulfur

Sulfur is an abundant and common element, but it is rarely found in a pure, uncombined form at Earth’s surface. As an element, sulfur is an important constituent of sulfate and sulfide minerals. It occurs in the dissolved ions of many waters. It is an important constituent of many atmospheric, subsurface, and dissolved gases. It is also an essential element in all living things and is contained in the organic molecules of fossil fuels.