mineral

Rough Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0 Mohs; Color: Royal blue with white calcite veining or mottled patches; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.2-2.3.

Hardness: 5
Color: Royal blue with white calcite veining or mottled patches
Luster: Vitreous to greasy

Identified July 2, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue with white calcite veining or mottled patches; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.2-2.3.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic zones (skarns) containing calcium-rich minerals.

Uses & applications

Used primarily for lapidary purposes, including beads, cabochons, and small carvings. It is also used as an architectural stone for tabletops and tiles.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but it lacks the metallic gold pyrite inclusions found in Lapis. It was famously used to decorate Marlborough House in London after Princess Patricia of Connaught visited Ontario, Canada.

Field identification & locations

Collectors identify it in the field by its intense blue color and lack of pyrite. Many specimens will fluoresce a bright orange-red or pink under UV light. Common locations include Bancroft (Ontario), Greenland, Brazil, and Namibia.