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Hydrogen Sulfide Chemical Information Sheet. Hydrogen sulfide is a colorless gas with a rotten-egg odor. Some people can smell hydrogen sulfide at very low levels, as low as 0.5 parts per billion (ppb) in air. Most hydrogen sulfide in the air comes from natural sources. It is produced when bacteria break down plant and animal material, often in stagnant waters with low oxygen content such as bogs and swamps. Volcanoes, hot springs and underwater thermal vents also release hydrogen sulfide.
Sulfides of many important metallic elements are naturally occurring minerals. For example, pyrite, which is also called foolâs gold owing to its brassy yellow colour, is a sulfide of iron with the formula FeS 2. Pyrite is a major source of iron and is one of the most abundant of the sulfur minerals.