A type of rock Schist is a metamorphic rock formed from mud or shale, which consists of layers of different minerals and can be split into thin irregular plates. Schist is often the host rock for a variety of gemstones that form in metamorphic rocks.
What is the symbol of the Tour de France, worn every day by the leader of the general individual classification at the end of each stage, and awarded at the end to the overall winner?
