Valentinite is a rare mineral found mainly in oxidised antimony deposits. It is also known as antimonite or senarmontite. Valentinite is composed of antimony trioxide and is usually formed as a result of the weathering and oxidation of stibnite, a common antimony ore. Despite its rarity, there are several synonyms for valentinite, including antimonian, antimonate, antimonious, and antimony-glance. These terms usually relate to the presence of antimony, which are elements that create the major characteristics of valentinite. Nonetheless, despite the many synonyms associated with valentinite, it remains a vital mineral used in the production of various antimony-based products.