thulite

{{Infobox mineral | name = Thulite | category = Sorosilicate variety | boxwidth = | boxbgcolor = #f17777 | image = Thulite.jpg | caption = Thulite from Leksvik, Norway. | formula = (Ca,Mn)2Al3(SiO4)(Si2O7)O(OH) | color = Pink | habit = Massive | system = Orthorhombic | twinning = | cleavage = Perfect {010} imperfect {100} | fracture = Uneven to conchoidal | mohs = 6.5 | luster = Vitreous, pearly on cleavage surfaces | refractive = 1.69–1.70 | opticalprop = biaxial positive | birefringence = 0.006–0.018 | pleochroism = Present, dichroism or trichroism depending on color. | streak = White or colorless | gravity = 3.10–3.38 | Density = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = }}

Thulite (sometimes called rosaline) 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 mottled with white calcite and occurs as veins and fracture fillings transecting many types of rock. In mineralogical literature, thulite may sometimes refer to any pink zoisite. Clinothulite is the manganese bearing variety of monoclinic clinozoisite.