An electron-ordering transition occurring in a mixed-valent system that results in an ordering of formal @V06588@ states in the low-temperature phase. Example: The prototype system, first identified by Verwey, is the ferrospinel magnetite, Fe³⁺[Fe³⁺Fe²⁺]O₄ in which an ordering of Fe³⁺ and Fe²⁺ ions within octahedral sites is thought to occur below \(T_{\text{v}}\approx 120\ \text{K}\).