description Sodalite Overview
Sodalite is a blue to blue-violet tectosilicate mineral in the feldspathoid group, with an ideal composition of Na4Al3Si3O12Cl. First reported in Greenland in 1811, it crystallizes in the cubic system and commonly occurs as massive material in sodium-rich igneous rocks such as nepheline syenite, rather than as large crystals. Opaque blue sodalite, often marked by white veining, is cut into cabochons, beads, inlay, and other ornamental objects. [Geology.com](https://geology.com/minerals/sodalite.shtml)
help Sodalite FAQ
What is sodalite made of?
Sodalite is a blue to blue-violet tectosilicate mineral with the ideal formula Na4Al3Si3O12Cl. It belongs to the feldspathoid group.
What color is sodalite?
Sodalite is commonly blue or blue-violet, although white and gray areas may occur. Its strong blue color is one reason it is used as a decorative stone.
Where does sodalite form?
It commonly occurs as massive material in sodium-rich igneous rocks. These rocks are typically silica-poor and alkaline compared with ordinary granite.
When was sodalite first reported?
Sodalite was first reported from Greenland in 1811. It crystallizes in the cubic system, although gem-quality material is often found as massive rather than sharply formed crystals.
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