BRONZITE, in mineralogy, a member of the pyroxene group that crystallizes in rhombic system (see PYROXENE). The name was originally applied to the members of the series exhibiting a bronzelike lustre, due to the presence of regularly arranged inclu sions. These inclusions appear in most cases to be ilmenite ar ranged in plates parallel to the crystallographic plane (I00). They are probably, as in the similar case of diallage (q.v.), products of unmixing, separating from solid solution in the pyroxene on fall of temperature.