Sodalite in Matrix (Sunset Sodalite)

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey/white with orange or black inclusions; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33.

Formation & Geological History

Forms in sodium-rich igneous rocks (nepheline syenites) through crystallization from silicate magmas or hydrothermal processes. Major deposits are found in alkaline intrusive complexes.

Uses & Applications

Primarily used for decorative carvings, lapidary items like this polished sphere, jewelry (cabochons), and as a collector's specimen.

Geological Facts

Sodalite was first discovered in Greenland in 1811 but became commercially popular after large deposits were found in Ontario, Canada, during a royal visit by Princess Margaret of Connaught, earning it the nickname 'Princess Blue'.

Field Identification & Locations

Identify by its rich blue color striped with white calcite or veins of black/grey/orange matrix. It often fluoresces a bright orange under long-wave UV light. Found in Canada, Brazil, Greenland, and Namibia.

Identified on: 5/3/2026

Mode: Standard