Bronzite is actually a hypersthene (part of the pyroxene group) that has been chemically "weathered." The process creates a new, opaque stone with a submetallic luster, especially on its cleavage surfaces.
Bronzite often contains inclusions of highly reflective minerals, such as hematite and goethite, which give it a beautiful bronzelike effect when polished (hence its name). Some beads also exhibit a cat's-eye effect.
Bronzite ranges from greenish-black to brown and has medium hardness. The stone is found in Syria, Austria, South Africa, and the U.S.A. (Montana)