One characteristic of sulfur is that it is a solid at room temperature. It appears in the form of yellow crystals or a yellow powder.
Sulfur naturally occurs with volcanic activity. It has a relative atomic mass of 32.066 and a density of 2086. It is nontoxic when it is in the form of the element itself as well as when it is in the form of sulfate. However, sulfur dioxide, hydrogen sulfide and carbon disulfide are all toxic. All living things contain sulfur in them, and the average human body contains about 140 grams. It is an element that is essential to all living things. Sulfur is a contaminant of fossil fuels, and it can lead to acid rain if the fuels are burnt without being purified. The leading producer of sulfur products is China.