Zoisite, first known as saualpite, after its type locality, is a calcium aluminum hydroxy sorosilicate. Its chemical formula is Ca2Al3O. It was formerly considered a member of the epidote group.

Sigmund Zois Freiherr von Edelstein, usually referred as Sigmund Zois was a Carniolan nobleman, natural scientist and patron of the arts. He is considered one of the most influential figures of the En