Pyrite, commonly known as fool's gold, is a sulfide mineral containing iron. When exposed to oxygen, the color darkens, turning from a brass-yellow to shades of brown. This specimen is on calcite, a mineral made of calcium carbonate.
Science Tuesday: The Science of Snow (December 2016) Science Tuesdays is an ongoing educational experience, offering science programming based on changing themes each month. Science Tuesdays take place throughout the day on Tuesdays at the Museum and include a variety of activities and interactive displays.