Hematite is a type of mineral that can be found in many different colors. The most common hematite is green, but there are also brown, black, and white hematites. To clean hematite, you will need to first remove any dirt or other debris that has built up on the surface of the mineral. Next, you will need to use a mild soap and water to clean the hematite. Be sure to dry the hematite before storing it.