Sodalite
JewelryWiki Editorial·3 sources·Reviewed 2026-08-04
One of the lightest gems in common use at SG 2.14–2.40, and a component of lapis lazuli as well as a stone in its own right.
Properties
| Property | Value | Authority |
|---|---|---|
| Mohs hardness | 5½–6 [1] | — |
| Refractive index | 1.480 [1] | — |
| Specific gravity | 2.14–2.40 [1] | — |
| Chemical formula | Na8Al6Si6O24Cl2 [3] | — |
| Crystal system | Cubic [2] | — |
Sources
- International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)
- Wikipedia — mineral article infoboxes (crystal system) — Wikipedia contributors (Wikipedia mineral infoboxes)
- Handbook of Mineralogy — Mineral Data Publishing / Mineralogical Society of America (Handbook of Mineralogy, Mineral Data Publishing)