Properties
| Category | Tectosilicate minerals |
|---|---|
| Formula | Na; 8(Al; 6Si; 6O; 24)Cl; 2 |
| Crystal system | Cubic |
| Color | Rich royal blue, green, yellow, violet, white veining common |
| Crystal habit | Massive; rarely as dodecahedra |
| Cleavage | Poor on {110} |
| Fracture | Conchoidal to uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 5.5–6 |
| Luster | Dull vitreous to greasy |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.27–2.33 |
From the Wikipedia article
Sodalite is a tectosilicate mineral with the formula Na8(Al6Si6O24)Cl2, with royal blue varieties widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group with hauyne, nosean, lazurite and tugtupite.
Source
Source record: crystal-compendium/sodalite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Sodalite — revision id 1347090238. Text and properties from Wikipedia, licensed CC BY-SA 4.0.