Formula: {Ca₂}{Al,Mn³⁺₃}(Si₂O₇)(SiO₄)O(OH)

Species: Silicates – (Sorosilicates)

Colour: pink

Name: Named after “Thule”, the ancient name of Scandinavia (and mythical island).

First Recorded Locality: Øvstebø, Kleppan, Sauland, Hjartdal, Vestfold og Telemark – Norway

A pink variety of zoisite, frequently manganian, i.e. containing trivalent Mn (not manganoan, which refers to divalent Mn). “Thulite” from granite pegmatites and some metamorphic rocks is frequently the clinothulite variety of clinozoisite and not true zoisite.