Ferronigerite is a rare mineral that belongs to the columbite group of minerals. Some synonyms of ferronigerite include ferrocolumbite, ferro-tantalite and iron-rich columbite. These minerals are found in igneous rocks and can be found in a variety of colors including brown, black and dull gray. Ferronigerite is commonly used as a source of niobium, which is critical in the construction of high-strength steel, aircraft components and electronic capacitors. This mineral is usually associated with other minerals such as tantalite and columbite. Other synonyms that are related to ferronigerite include manganocolumbite and stibiocolumbite, which are also rich in niobium and tantalum.