Sulfur is one of the few elements that is found in its elemental form in nature. Typical sulfur deposits occur in sedimentary limestone/gypsum formations, in limestone/anhydrite formations associated with salt domes, or in volcanic rock [1]. A yellow solid at room temperature, sulfur becomes progressively lighter in color at lower temperatures and is almost white at the temperature of liquid air. It melts at 114–119 °C (depending on crystalline form) to a yellow liquid which turns orange as the temperature is increased. The low viscosity of the liquid begins to rise sharply above 160 °C, peaking at 93 Pas at 188 °C, and then falling as the temperature continues to rise to its boiling point of 445 °C. This and other anomalous properties of the liquid state are due to equilibria between the various molecular species of sulfur, which includes small chains and rings.