Legrandite is a rare mineral that was first discovered in Mexico in the mid-20th century. It is a complex copper arsenate that exhibits bright green, yellow and orange colours. Legrandite is often referred to by its chemical formula, Cu2(AsO4)(OH). Legrandite is also commonly known by synonyms such as copper arsenate hydroxide, copper arsenate hydrate and copper orthoarsenate hydroxide. Legrandite is popular among mineral collectors due to its unique colouration and crystalline structure. It is also of interest to the scientific community due to its potential as a battery component, and researchers continue to study its properties to find out more about its applications and uses.