Hematite is a crystal made of iron oxide; it is one of the most abundant minerals on the earth's surface. The stone is known for its black color and metallic sheen. Its distinguishing feature is a red scratch visible when the surface is scratched.Hematite minerals have been used for protection for thousands of years. One of the main ways this crystal has been used is to protect against excessive bleeding. It is also believed to add confidence to shy people.