Thulite is a translucent, crystalline or massive pink manganese-bearing variety of the mineral zoisite. Manganese substitutes for calcium in the structure with up to two percent Mn2+. Thulite is often

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.