Freibergite is a relatively rare sulfosalt mineral that is commonly found in hydrothermal veins associated with silver, copper, and other base metal ores. Some synonyms for freibergite include German silver ore, freiberg silver, and argyrodite. Other related minerals include tetrahedrite, bournonite, and enargite. Freibergite is known for its metallic luster, high density, and distinctive red-brown to black color. Its chemical formula is Cu12Sb4S13, and it is composed of copper, antimony, and sulfur. Freibergite is often used as a source of copper in the production of electrical wires, coins, and other metallic objects. Its rarity and unique properties make it a valuable mineral among collectors and scientists alike.