mineral

Sodalite in Matrix (Sunset Sodalite)

Sodalite Na8(Al6Si6O24)Cl2

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.

Hardness: 5
Color: Royal blue to grey/white with orange or black inclusions
Luster: Vitreous to greasy

Identified May 3, 2026More mineral →

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Physical properties

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.

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