Sodalite is an aluminum and sodium silicate (from which it owes its name) in which potassium is often present in small quantities to replace sodium. The color of the compact masses is varied: white, gray, greenish, yellowish, blue-blue, blue-lavender, slightly red; the coloring is irregular, most commonly staked with more or less intense white and blue. Sodalite is generally found associated with nepheline and cancrinite in transparent, pale crystals of an inconspicuous white and gray color, and rarely even greenish; crystals of a magnificent light blue are also rare, especially of considerable size, coming from south-west Africa. The light blue sodalite is abundant in compact, translucent, opaque masses, which can easily be misintepreted with lapis lazuli for its very similar color.
Important sodalite deposits are located in Brazil in Bahia, India, in various locations in the United States, Africa, Canada and Russia. In Italy it occurs in the geodes of the volcanic products of Vesuvius and Lazio, where well-formed rhombododecahedron crystals are found, generally white in color.
It is used as an ornamental stone and has the same application as lapis lazuli; bracelets, necklaces, curved surface stones and even small figurines are made of them.