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Sodalite

Sodalite is usually blue to blue-purple in color and is found with nepheline and other feldspar minerals. It is generally translucent, with a vitreous luster, and has a Mohs hardness of 5.5 to 6.
Sodalite often has white veins and can be confused with lapis lazuli. Small amounts of sodalite are present in meny specimens of lapis lazuli.

Blue is a rare color for rocks and minerals. When was the last time you found a bright blue rock? Have you ever found one in the wild? When you find a blue rock - especially a rock capable of serving as a precious stone - it immediately has a market. Sodalite is one of the only bright blue materials that is still sold at a reasonable price.

The main sodalite deposits are located in Afghanistan, Bolivia, Brazil, Canada, the United States, France, Greenland, India, Italy, Namibia, Pakistan and South West Africa.

Learn more about sodalite: Wikipedia