Characteristics of Sodalite:

Chemical Name: Sodium aluminosilicate chloride

Formula: Na4Si3Al3O12Cl or Na4(Si3Al3)O12Cl.

Colors: Grey, white, blue

Structure: Cubic

Hardness: 5.5-6

Specific Gravity: 2.1 - 2.4

Refractive Index: 1.48

Lustre: Vitreous to greasy

Streak: White to light blue

Locations: Russia, Germany, India, Canada, USA

What is Sodalite? 

Sodalite is the mineral sometimes mistaken for Lapis Lazuli. It can also ben one of the constituents of Lapis Lazuli, but is visually different, as the latter contains small crystals of pyrite. It is one of only minerals whose only use is as a gemstone – often veined with calcite, it is favored by carvers for its interesting patterns. It is usually cut en cabochon, but rare transparent material from Mon-Sain-Hilaire, Canada, is faceted for collectors. Single pieces can weigh many kilograms.

Sodalite is named in 1811 for its high sodium content.