Sulfur can be easily identified by its yellow color and its "rotten egg" smell when burned. It can be found at or near crater rims of active volcanoes and is frequently associated with the cap rock of salt domes in Texas, Louisiana, and the Gulf of Mexico. It is used in the manufacture of sulfuric acid as fertilizers, insecticides and explosives, as well as in paper manufacture.

Mineral Photos courtesy of R.Weller/Cochise College