The following information is from the website:- http://en.wikipedia.org/wiki/Sodalite
Sodalite is a rich royal blue mineral widely enjoyed as an ornamentalgemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group and—together with hauyne, nosean, and lazurite—is a common constituent of lapis lazuli.
Discovered in 1806 in the Ilimaussaq intrusive complex in Greenland, sodalite did not become important as an ornamental stone until 1891 when vast deposits of fine material were discovered in Ontario, Canada.
The hardness (Mohs scale) : 5.5 - 6.0
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