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A nice piece of gemmy blue sodalite. The blue sodalite on this piece is very tenebrescent and changes color when exposed to UV (SW), darkening to a light purple - a unique hue compared to other Greenland sodalites due to the natural blue coloring. Under SW it starts out orange but quickly shifts to a rusty color due to the tenebrescence (see animation below to view the tenebrescent change).
The natural color is a beautiful blue - one of the only blue sodalites which is strongly fluorescent, not to mention slightly tenebrescent.
Many Greenland blue sodalite specimens also contain steenstrupine - a uranium crystal found in Greenland. It is less radioactive than your kitchen's granite countertop, but still a sought after mineral.
