Bloodstone, also known as heliotrope, is a green variety of chalcedony that contains red or orange spots or streaks, typically caused by the presence of iron oxide. The green color is due to chlorite or other minerals, while the red spots resemble drops of blood, giving it its name. Bloodstone is often used in jewelry, beads, and carvings because of its striking appearance. It has a Mohs hardness of 6.5 to 7, making it durable enough for a variety of applications. Major sources of bloodstone include India, Brazil, and China.