Sulfur (S) is an element and elementary substance, solid under usual conditions. It along with charcoal and potassium nitrate are the main ingredients in gunpowder. (SG1: "Small Victories")
The Gadmeer were also sulfur-based life forms. (SG1: "Scorched Earth")
Dr. Nicholas Rush said that Squigglers' lair smells like sulfur. (SGU: "Time")
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