mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Hardness: 5.5-6.0 on Mohs scale; Color: typically royal blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: typically royal blue, often with white calcite veining
Luster: Vitreous to greasy

Identified March 17, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 5.5-6.0 on Mohs scale; Color: typically royal blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It crystallizes from alkali-rich magmas or through hydrothermal replacement. It is often found in massive form rather than distinct crystals.

Uses & applications

Primarily used for ornamental purposes including beads, cabochons, carvings, and architectural tiles. It is also a popular collector's mineral and a source of sodium in certain industrial applications.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became historically famous after a large deposit was found in Ontario, Canada, during a royal visit by Princess Margaret, leading it to be nicknamed 'Princess Blue.' It is often confused with Lapis Lazuli, but Sodalite lacks the gold pyrite inclusions and has a lower specific gravity.

Field identification & locations

Field identification is based on its deep blue color and the presence of white (Calcite) streaks. Unlike Lapis Lazuli, it will not have brassy pyrite specks. It is common in Bancrofter, Ontario; Brazil; Namibia; and Russia.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral