mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5-6 (Mohs scale); Color: Royal blue to gray, often with white streaks; Luster: Vitreous; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33
- Hardness
- 5
- Color
- Royal blue to gray, often with white streaks
- Luster
- Vitreous
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Physical properties
Hardness: 5.5-6 (Mohs scale); Color: Royal blue to gray, often with white streaks; Luster: Vitreous; 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 can also occur in contact metamorphic rocks such as marbles. Most deposits date from the Precambrian to Cenozoic eras.
Uses & applications
Used primarily as an ornamental stone, for jewelry (cabochons and beads), and as a collector's specimen. In industry, it was historically used as a source of pigment.
Geological facts
Sodalite is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains pyrite specks and is significantly lighter in weight. It is known for its strong orange fluorescence under long-wave UV light.
Field identification & locations
Identify in the field by its distinct royal blue color, greasy luster on fresh surfaces, and lack of pyrite. It is commonly found in Bancroft (Ontario), Brazil, Greenland, and Namibia.
