Scorodite is a common hydrated iron arsenate mineral. It is found in hydrothermal deposits and as a secondary mineral in gossans (intensely oxidized, weathered or decomposed rock) worldwide. Scorodite weathers to limonite. Named from the Greek Scorodion, "garlicky"; when heated it smells of garlic.
El Niño What is El Niño? How does it form? What is the difference between El Niño and La Niña? Which one produces heavy rain for the Western U.S.? Understand the science behind El Niño with this Weather Underground infographic.