Photograph by Kirk Treakle/Alamy
A volcano in Java, Indonesia, produces yellow deposits of sulfur that prove to be easy but dangerous pickings for a man collecting the mineral. Sulfur often combines into sulfides or sulfates. The nonmetallic element heals and destroys: Doctors use sulfur to treat fungal infections, but it is also a component of gunpowder. Sulfuric acid is an important industrial agent.