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This beautiful piece is solid Tugtupite. Its size is 2" long by 2" wide by 3/4" thick. Under shortwave ultraviolet, it fluoresces a beautiful, bright fiery red. It phosphoresces white when removed from shortwave ultraviolet.
Under longwave ultraviolet, it
fluoresces bright orange.
The pink color of Tugtupite fades when exposed to sunlight or bright
light. Exposing the Tugtupite to shortwave ultraviolet for a few
minutes will restore the pink color.
This behavior is called
tenebrescence.
The Name Tugtupite is from the
Tugtup agtakorfia on the west coast of Greenland.
Reference: Manuel Robbins, 1994. Fluorescence of gems and
minerals under
ultraviolet light, page 134.