Blue Sodalite (Hackmanite), Feldspar, Minor Tugtupite - Greenland
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A unique and unusual mineral specimen of very tenebrescent blue sodalite and what seems like tugtupite. You can note the pink fluorescent colored tugtupite in the center of the orange fluorescent sodalite. The area of pink fluorescence acts like tugtupite, but we aren't sure what it is. It could be rare phosphorescent sodalite.
The blue sodalite on this piece changes color when exposed to shortwave UV, darkening to a purple - a unique hue compared to other Greenland sodalites due to the natural blue coloring. Under longwave, the bright orange fluorescence is unmistakable, while under shortwave it starts out orange but quickly shifts to a rusty color due to the tenebrescence (see animation below to view the tenebrescent change).
Many of the pieces from this locality within the complex are associated with a relatively bright fluorescent feldspar (in syenite). Like other feldspars, it fluoresces a magenta color.
Bright green fluorescent areas are uranyl activated, unusual in that they occur mostly at the edges where the minerals intersect.
The natural color is a beautiful blue - one of the only blue sodalites which is strongly fluorescent, not to mention tenebrescent.