What is Thulite?


Thulite is a pink variety of the mineral zoisite and is often found in Norway, Australia, and the United States. It’s primarily used as a gemstone and is popular for its rosy pink color.

Thulite is a unique gemstone that comes in shades of rosy pink. Its vibrant hue and unique appearance make it a popular choice for jewelry and decorative items, especially beads and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Silicate (Zoisite)
ColorThulite is typically pink to reddish, often intergrown with white calcite or other minerals.
LusterVitreous to pearly.
OccurrenceNorway (where it was first discovered), the United States, and Australia.
FormationThulite forms in metamorphic rocks and is often found in massive form rather than crystals.
CleavagePerfect in two directions
Mohs Hardness6 to 7.
Specific Gravity3.10 to 3.38.
Diagnostic PropertiesPink, a variety of zoisite.
Chemical CompositionCa2Al3(SiO4)(Si2O7)O(OH)
Crystal SystemTriclinic (variety of Zoisite)
Optical PropertiesBiaxial (+)
Refractive IndexVaries due to mixture of minerals
Birefringence0.006 - 0.013
2V angleMeasured: 78° to 82°
DispersionNot notably high.