Copper is a native element and often occurs in fine-grained volcanic rocks such as basalt. It is red and orange in color until exposed to oxygen which can cause it to turn green and black over time. It was one of the first metals to be used by humans and was the first to be smelted from ores. This specimen is with native silver.
Science Tuesday: Amazing Explosions (July 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.