mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue, grayish, or lavender with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.4

Hardness: 5
Color: Royal blue, grayish, or lavender with white calcite veining
Luster: Vitreous to greasy

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue, grayish, or lavender with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.4

Formation & geological history

Forms primarily in alkali-rich igneous rocks like nepheline syenites and phonolites, as well as some contact-metamorphosed limestones.

Uses & applications

Used widely for ornamental carvings, beads in jewelry, countertops, and as a popular specimen for mineral collectors due to its deep blue hue.

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the gold-colored pyrite inclusions found in Lapis. It can sometimes show fluorescence under UV light, appearing bright orange or pink.

Field identification & locations

Look for a rich blue color with streaks of white or gray calcite. It is found in large deposits in Bancroft (Ontario), Brazil, and Greenland. It is softer than quartz and has a characteristic white streak.