Common naturally occurring sulfur compounds include the sulfide minerals , such as pyrite ( iron sulfide ) , cinnabar ( mercury sulfide ) , galena ( lead sulfide ) , sphalerite ( zinc sulfide ) and stibnite ( antimony sulfide ) ; and the sulfates , such as gypsum ( calcium sulfate ) , alunite ( potassium aluminium sulfate ) , and barite ( barium sulfate ) .
Mixture of sulfur oxides and water See also : Sulfide Salts of hydrogen sulfide See also : Sulfite Salts of sulfurous acid See also : Sulfate and bisulfate Salts of sulfuric acid Sulfur ( I ) compounds Sulfur ( II ) compounds Sulfur ( III ) compounds Sulfur ( IV ) compounds Sulfur ( V ) compounds Sulfur ( VI ) compounds