The presence of sulphur in the earth’s crust is only about 0.03-0.1%.
mixed sulphur exists primarily as sulphates such as gypsum , Epsom salt , baryte .
another source is by sulphides such as galena , zinc blende , copper pyrites . some sulphur also occurs as hydrogen sulphide in volcanoes. eggs, proteins, garlic, onion, mustard, hair and wool also contain sulphur.