A nonmetallic element occurring naturally in large
   quantities, either combined as in the sulphides (as pyrites) and
   sulphates (as gypsum), or native in volcanic regions, in vast beds
   mixed with gypsum and various earthy materials, from which it is melted
   out. Symbol S. Atomic weight 32. The specific gravity of ordinary
   octohedral sulphur is 2.05; of prismatic sulphur, 1.96.